Quelle Long.java Sprache: JAVA

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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package java.lang;

import java.lang.annotation.Native;
import java.lang.invoke.MethodHandles;
import java.lang.constant.Constable;
import java.lang.constant.ConstantDesc;
import java.math.*;
import java.util.Objects;
import java.util.Optional;

import jdk.internal.misc.CDS;
import jdk.internal.vm.annotation.ForceInline;
import jdk.internal.vm.annotation.IntrinsicCandidate;

import static java.lang.String.COMPACT_STRINGS;
import static java.lang.String.LATIN1;
import static java.lang.String.UTF16;

/**
* The {@code Long} class wraps a value of the primitive type {@code
* long} in an object. An object of type {@code Long} contains a
* single field whose type is {@code long}.
*
* In addition, this class provides several methods for converting
* a {@code long} to a {@code String} and a {@code String} to a {@code
* long}, as well as other constants and methods useful when dealing
* with a {@code long}.
*
* This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
* class; programmers should treat instances that are
* {@linkplain #equals(Object) equal} as interchangeable and should not
* use instances for synchronization, or unpredictable behavior may
* occur. For example, in a future release, synchronization may fail.
*
* Implementation note: The implementations of the "bit twiddling"
* methods (such as {@link #highestOneBit(long) highestOneBit} and
* {@link #numberOfTrailingZeros(long) numberOfTrailingZeros}) are
* based on material from Henry S. Warren, Jr.'s Hacker's
* Delight, (Addison Wesley, 2002).
*
* @author Lee Boynton
* @author Arthur van Hoff
* @author Josh Bloch
* @author Joseph D. Darcy
* @since 1.0
*/
@jdk.internal.ValueBased
public final class Long extends Number
 implements Comparable<Long>, Constable, ConstantDesc {
 /**
 * A constant holding the minimum value a {@code long} can
 * have, -263.
 */
 @Native public static final long MIN_VALUE = 0x8000000000000000L;

 /**
 * A constant holding the maximum value a {@code long} can
 * have, 263-1.
 */
 @Native public static final long MAX_VALUE = 0x7fffffffffffffffL;

 /**
 * The {@code Class} instance representing the primitive type
 * {@code long}.
 *
 * @since 1.1
 */
 @SuppressWarnings("unchecked")
 public static final Class<Long> TYPE = (Class<Long>) Class.getPrimitiveClass("long");

 /**
 * Returns a string representation of the first argument in the
 * radix specified by the second argument.
 *
 * If the radix is smaller than {@code Character.MIN_RADIX}
 * or larger than {@code Character.MAX_RADIX}, then the radix
 * {@code 10} is used instead.
 *
 * If the first argument is negative, the first element of the
 * result is the ASCII minus sign {@code '-'}
 * ({@code '\u005Cu002d'}). If the first argument is not
 * negative, no sign character appears in the result.
 *
 * The remaining characters of the result represent the magnitude
 * of the first argument. If the magnitude is zero, it is
 * represented by a single zero character {@code '0'}
 * ({@code '\u005Cu0030'}); otherwise, the first character of
 * the representation of the magnitude will not be the zero
 * character. The following ASCII characters are used as digits:
 *
 * <blockquote>
 * {@code 0123456789abcdefghijklmnopqrstuvwxyz}
 * </blockquote>
 *
 * These are {@code '\u005Cu0030'} through
 * {@code '\u005Cu0039'} and {@code '\u005Cu0061'} through
 * {@code '\u005Cu007a'}. If {@code radix} is
 * <var>N</var>, then the first <var>N</var> of these characters
 * are used as radix-<var>N</var> digits in the order shown. Thus,
 * the digits for hexadecimal (radix 16) are
 * {@code 0123456789abcdef}. If uppercase letters are
 * desired, the {@link java.lang.String#toUpperCase()} method may
 * be called on the result:
 *
 * <blockquote>
 * {@code Long.toString(n, 16).toUpperCase()}
 * </blockquote>
 *
 * @param i a {@code long} to be converted to a string.
 * @param radix the radix to use in the string representation.
 * @return a string representation of the argument in the specified radix.
 * @see java.lang.Character#MAX_RADIX
 * @see java.lang.Character#MIN_RADIX
 */
 public static String toString(long i, int radix) {
 if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX)
 radix = 10;
 if (radix == 10)
 return toString(i);

 if (COMPACT_STRINGS) {
 byte[] buf = new byte[65];
 int charPos = 64;
 boolean negative = (i < 0);

 if (!negative) {
 i = -i;
 }

 while (i <= -radix) {
 buf[charPos--] = (byte)Integer.digits[(int)(-(i % radix))];
 i = i / radix;
 }
 buf[charPos] = (byte)Integer.digits[(int)(-i)];

 if (negative) {
 buf[--charPos] = '-';
 }
 return StringLatin1.newString(buf, charPos, (65 - charPos));
 }
 return toStringUTF16(i, radix);
 }

 private static String toStringUTF16(long i, int radix) {
 byte[] buf = new byte[65 * 2];
 int charPos = 64;
 boolean negative = (i < 0);
 if (!negative) {
 i = -i;
 }
 while (i <= -radix) {
 StringUTF16.putChar(buf, charPos--, Integer.digits[(int)(-(i % radix))]);
 i = i / radix;
 }
 StringUTF16.putChar(buf, charPos, Integer.digits[(int)(-i)]);
 if (negative) {
 StringUTF16.putChar(buf, --charPos, '-');
 }
 return StringUTF16.newString(buf, charPos, (65 - charPos));
 }

 /**
 * Returns a string representation of the first argument as an
 * unsigned integer value in the radix specified by the second
 * argument.
 *
 * If the radix is smaller than {@code Character.MIN_RADIX}
 * or larger than {@code Character.MAX_RADIX}, then the radix
 * {@code 10} is used instead.
 *
 * Note that since the first argument is treated as an unsigned
 * value, no leading sign character is printed.
 *
 * If the magnitude is zero, it is represented by a single zero
 * character {@code '0'} ({@code '\u005Cu0030'}); otherwise,
 * the first character of the representation of the magnitude will
 * not be the zero character.
 *
 * The behavior of radixes and the characters used as digits
 * are the same as {@link #toString(long, int) toString}.
 *
 * @param i an integer to be converted to an unsigned string.
 * @param radix the radix to use in the string representation.
 * @return an unsigned string representation of the argument in the specified radix.
 * @see #toString(long, int)
 * @since 1.8
 */
 public static String toUnsignedString(long i, int radix) {
 if (i >= 0)
 return toString(i, radix);
 else {
 return switch (radix) {
 case 2 -> toBinaryString(i);
 case 4 -> toUnsignedString0(i, 2);
 case 8 -> toOctalString(i);
 case 10 -> {
 /*
 * We can get the effect of an unsigned division by 10
 * on a long value by first shifting right, yielding a
 * positive value, and then dividing by 5. This
 * allows the last digit and preceding digits to be
 * isolated more quickly than by an initial conversion
 * to BigInteger.
 */
 long quot = (i >>> 1) / 5;
 long rem = i - quot * 10;
 yield toString(quot) + rem;
 }
 case 16 -> toHexString(i);
 case 32 -> toUnsignedString0(i, 5);
 default -> toUnsignedBigInteger(i).toString(radix);
 };
 }
 }

 /**
 * Return a BigInteger equal to the unsigned value of the
 * argument.
 */
 private static BigInteger toUnsignedBigInteger(long i) {
 if (i >= 0L)
 return BigInteger.valueOf(i);
 else {
 int upper = (int) (i >>> 32);
 int lower = (int) i;

 // return (upper << 32) + lower
 return (BigInteger.valueOf(Integer.toUnsignedLong(upper))).shiftLeft(32).
 add(BigInteger.valueOf(Integer.toUnsignedLong(lower)));
 }
 }

 /**
 * Returns a string representation of the {@code long}
 * argument as an unsigned integer in base 16.
 *
 * The unsigned {@code long} value is the argument plus
 * 264 if the argument is negative; otherwise, it is
 * equal to the argument. This value is converted to a string of
 * ASCII digits in hexadecimal (base 16) with no extra
 * leading {@code 0}s.
 *
 * The value of the argument can be recovered from the returned
 * string {@code s} by calling {@link
 * Long#parseUnsignedLong(String, int) Long.parseUnsignedLong(s,
 * 16)}.
 *
 * If the unsigned magnitude is zero, it is represented by a
 * single zero character {@code '0'} ({@code '\u005Cu0030'});
 * otherwise, the first character of the representation of the
 * unsigned magnitude will not be the zero character. The
 * following characters are used as hexadecimal digits:
 *
 * <blockquote>
 * {@code 0123456789abcdef}
 * </blockquote>
 *
 * These are the characters {@code '\u005Cu0030'} through
 * {@code '\u005Cu0039'} and {@code '\u005Cu0061'} through
 * {@code '\u005Cu0066'}. If uppercase letters are desired,
 * the {@link java.lang.String#toUpperCase()} method may be called
 * on the result:
 *
 * <blockquote>
 * {@code Long.toHexString(n).toUpperCase()}
 * </blockquote>
 *
 * @apiNote
 * The {@link java.util.HexFormat} class provides formatting and parsing
 * of byte arrays and primitives to return a string or adding to an {@link Appendable}.
 * {@code HexFormat} formats and parses uppercase or lowercase hexadecimal characters,
 * with leading zeros and for byte arrays includes for each byte
 * a delimiter, prefix, and suffix.
 *
 * @param i a {@code long} to be converted to a string.
 * @return the string representation of the unsigned {@code long}
 * value represented by the argument in hexadecimal
 * (base 16).
 * @see java.util.HexFormat
 * @see #parseUnsignedLong(String, int)
 * @see #toUnsignedString(long, int)
 * @since 1.0.2
 */
 public static String toHexString(long i) {
 return toUnsignedString0(i, 4);
 }

 /**
 * Returns a string representation of the {@code long}
 * argument as an unsigned integer in base 8.
 *
 * The unsigned {@code long} value is the argument plus
 * 264 if the argument is negative; otherwise, it is
 * equal to the argument. This value is converted to a string of
 * ASCII digits in octal (base 8) with no extra leading
 * {@code 0}s.
 *
 * The value of the argument can be recovered from the returned
 * string {@code s} by calling {@link
 * Long#parseUnsignedLong(String, int) Long.parseUnsignedLong(s,
 * 8)}.
 *
 * If the unsigned magnitude is zero, it is represented by a
 * single zero character {@code '0'} ({@code '\u005Cu0030'});
 * otherwise, the first character of the representation of the
 * unsigned magnitude will not be the zero character. The
 * following characters are used as octal digits:
 *
 * <blockquote>
 * {@code 01234567}
 * </blockquote>
 *
 * These are the characters {@code '\u005Cu0030'} through
 * {@code '\u005Cu0037'}.
 *
 * @param i a {@code long} to be converted to a string.
 * @return the string representation of the unsigned {@code long}
 * value represented by the argument in octal (base 8).
 * @see #parseUnsignedLong(String, int)
 * @see #toUnsignedString(long, int)
 * @since 1.0.2
 */
 public static String toOctalString(long i) {
 return toUnsignedString0(i, 3);
 }

 /**
 * Returns a string representation of the {@code long}
 * argument as an unsigned integer in base 2.
 *
 * The unsigned {@code long} value is the argument plus
 * 264 if the argument is negative; otherwise, it is
 * equal to the argument. This value is converted to a string of
 * ASCII digits in binary (base 2) with no extra leading
 * {@code 0}s.
 *
 * The value of the argument can be recovered from the returned
 * string {@code s} by calling {@link
 * Long#parseUnsignedLong(String, int) Long.parseUnsignedLong(s,
 * 2)}.
 *
 * If the unsigned magnitude is zero, it is represented by a
 * single zero character {@code '0'} ({@code '\u005Cu0030'});
 * otherwise, the first character of the representation of the
 * unsigned magnitude will not be the zero character. The
 * characters {@code '0'} ({@code '\u005Cu0030'}) and {@code
 * '1'} ({@code '\u005Cu0031'}) are used as binary digits.
 *
 * @param i a {@code long} to be converted to a string.
 * @return the string representation of the unsigned {@code long}
 * value represented by the argument in binary (base 2).
 * @see #parseUnsignedLong(String, int)
 * @see #toUnsignedString(long, int)
 * @since 1.0.2
 */
 public static String toBinaryString(long i) {
 return toUnsignedString0(i, 1);
 }

 /**
 * Format a long (treated as unsigned) into a String.
 * @param val the value to format
 * @param shift the log2 of the base to format in (4 for hex, 3 for octal, 1 for binary)
 */
 static String toUnsignedString0(long val, int shift) {
 // assert shift > 0 && shift <=5 : "Illegal shift value";
 int mag = Long.SIZE - Long.numberOfLeadingZeros(val);
 int chars = Math.max(((mag + (shift - 1)) / shift), 1);
 if (COMPACT_STRINGS) {
 byte[] buf = new byte[chars];
 formatUnsignedLong0(val, shift, buf, 0, chars);
 return new String(buf, LATIN1);
 } else {
 byte[] buf = new byte[chars * 2];
 formatUnsignedLong0UTF16(val, shift, buf, 0, chars);
 return new String(buf, UTF16);
 }
 }

 /**
 * Format a long (treated as unsigned) into a byte buffer (LATIN1 version). If
 * {@code len} exceeds the formatted ASCII representation of {@code val},
 * {@code buf} will be padded with leading zeroes.
 *
 * @param val the unsigned long to format
 * @param shift the log2 of the base to format in (4 for hex, 3 for octal, 1 for binary)
 * @param buf the byte buffer to write to
 * @param offset the offset in the destination buffer to start at
 * @param len the number of characters to write
 */
 private static void formatUnsignedLong0(long val, int shift, byte[] buf, int offset, int len) {
 int charPos = offset + len;
 int radix = 1 << shift;
 int mask = radix - 1;
 do {
 buf[--charPos] = (byte)Integer.digits[((int) val) & mask];
 val >>>= shift;
 } while (charPos > offset);
 }

 /**
 * Format a long (treated as unsigned) into a byte buffer (UTF16 version). If
 * {@code len} exceeds the formatted ASCII representation of {@code val},
 * {@code buf} will be padded with leading zeroes.
 *
 * @param val the unsigned long to format
 * @param shift the log2 of the base to format in (4 for hex, 3 for octal, 1 for binary)
 * @param buf the byte buffer to write to
 * @param offset the offset in the destination buffer to start at
 * @param len the number of characters to write
 */
 private static void formatUnsignedLong0UTF16(long val, int shift, byte[] buf, int offset, int len) {
 int charPos = offset + len;
 int radix = 1 << shift;
 int mask = radix - 1;
 do {
 StringUTF16.putChar(buf, --charPos, Integer.digits[((int) val) & mask]);
 val >>>= shift;
 } while (charPos > offset);
 }

 static String fastUUID(long lsb, long msb) {
 if (COMPACT_STRINGS) {
 byte[] buf = new byte[36];
 formatUnsignedLong0(lsb, 4, buf, 24, 12);
 formatUnsignedLong0(lsb >>> 48, 4, buf, 19, 4);
 formatUnsignedLong0(msb, 4, buf, 14, 4);
 formatUnsignedLong0(msb >>> 16, 4, buf, 9, 4);
 formatUnsignedLong0(msb >>> 32, 4, buf, 0, 8);

 buf[23] = '-';
 buf[18] = '-';
 buf[13] = '-';
 buf[8] = '-';

 return new String(buf, LATIN1);
 } else {
 byte[] buf = new byte[72];

 formatUnsignedLong0UTF16(lsb, 4, buf, 24, 12);
 formatUnsignedLong0UTF16(lsb >>> 48, 4, buf, 19, 4);
 formatUnsignedLong0UTF16(msb, 4, buf, 14, 4);
 formatUnsignedLong0UTF16(msb >>> 16, 4, buf, 9, 4);
 formatUnsignedLong0UTF16(msb >>> 32, 4, buf, 0, 8);

 StringUTF16.putChar(buf, 23, '-');
 StringUTF16.putChar(buf, 18, '-');
 StringUTF16.putChar(buf, 13, '-');
 StringUTF16.putChar(buf, 8, '-');

 return new String(buf, UTF16);
 }
 }

 /**
 * Returns a {@code String} object representing the specified
 * {@code long}. The argument is converted to signed decimal
 * representation and returned as a string, exactly as if the
 * argument and the radix 10 were given as arguments to the {@link
 * #toString(long, int)} method.
 *
 * @param i a {@code long} to be converted.
 * @return a string representation of the argument in base 10.
 */
 public static String toString(long i) {
 int size = stringSize(i);
 if (COMPACT_STRINGS) {
 byte[] buf = new byte[size];
 getChars(i, size, buf);
 return new String(buf, LATIN1);
 } else {
 byte[] buf = new byte[size * 2];
 StringUTF16.getChars(i, size, buf);
 return new String(buf, UTF16);
 }
 }

 /**
 * Returns a string representation of the argument as an unsigned
 * decimal value.
 *
 * The argument is converted to unsigned decimal representation
 * and returned as a string exactly as if the argument and radix
 * 10 were given as arguments to the {@link #toUnsignedString(long,
 * int)} method.
 *
 * @param i an integer to be converted to an unsigned string.
 * @return an unsigned string representation of the argument.
 * @see #toUnsignedString(long, int)
 * @since 1.8
 */
 public static String toUnsignedString(long i) {
 return toUnsignedString(i, 10);
 }

 /**
 * Places characters representing the long i into the
 * character array buf. The characters are placed into
 * the buffer backwards starting with the least significant
 * digit at the specified index (exclusive), and working
 * backwards from there.
 *
 * @implNote This method converts positive inputs into negative
 * values, to cover the Long.MIN_VALUE case. Converting otherwise
 * (negative to positive) will expose -Long.MIN_VALUE that overflows
 * long.
 *
 * @param i value to convert
 * @param index next index, after the least significant digit
 * @param buf target buffer, Latin1-encoded
 * @return index of the most significant digit or minus sign, if present
 */
 static int getChars(long i, int index, byte[] buf) {
 long q;
 int r;
 int charPos = index;

 boolean negative = (i < 0);
 if (!negative) {
 i = -i;
 }

 // Get 2 digits/iteration using longs until quotient fits into an int
 while (i <= Integer.MIN_VALUE) {
 q = i / 100;
 r = (int)((q * 100) - i);
 i = q;
 buf[--charPos] = Integer.DigitOnes[r];
 buf[--charPos] = Integer.DigitTens[r];
 }

 // Get 2 digits/iteration using ints
 int q2;
 int i2 = (int)i;
 while (i2 <= -100) {
 q2 = i2 / 100;
 r = (q2 * 100) - i2;
 i2 = q2;
 buf[--charPos] = Integer.DigitOnes[r];
 buf[--charPos] = Integer.DigitTens[r];
 }

 // We know there are at most two digits left at this point.
 buf[--charPos] = Integer.DigitOnes[-i2];
 if (i2 < -9) {
 buf[--charPos] = Integer.DigitTens[-i2];
 }

 if (negative) {
 buf[--charPos] = (byte)'-';
 }
 return charPos;
 }

 /**
 * Returns the string representation size for a given long value.
 *
 * @param x long value
 * @return string size
 *
 * @implNote There are other ways to compute this: e.g. binary search,
 * but values are biased heavily towards zero, and therefore linear search
 * wins. The iteration results are also routinely inlined in the generated
 * code after loop unrolling.
 */
 static int stringSize(long x) {
 int d = 1;
 if (x >= 0) {
 d = 0;
 x = -x;
 }
 long p = -10;
 for (int i = 1; i < 19; i++) {
 if (x > p)
 return i + d;
 p = 10 * p;
 }
 return 19 + d;
 }

 /**
 * Parses the string argument as a signed {@code long} in the
 * radix specified by the second argument. The characters in the
 * string must all be digits of the specified radix (as determined
 * by whether {@link java.lang.Character#digit(char, int)} returns
 * a nonnegative value), except that the first character may be an
 * ASCII minus sign {@code '-'} ({@code '\u005Cu002D'}) to
 * indicate a negative value or an ASCII plus sign {@code '+'}
 * ({@code '\u005Cu002B'}) to indicate a positive value. The
 * resulting {@code long} value is returned.
 *
 * Note that neither the character {@code L}
 * ({@code '\u005Cu004C'}) nor {@code l}
 * ({@code '\u005Cu006C'}) is permitted to appear at the end
 * of the string as a type indicator, as would be permitted in
 * Java programming language source code - except that either
 * {@code L} or {@code l} may appear as a digit for a
 * radix greater than or equal to 22.
 *
 * An exception of type {@code NumberFormatException} is
 * thrown if any of the following situations occurs:
 * <ul>
 *
 * <li>The first argument is {@code null} or is a string of
 * length zero.
 *
 * <li>The {@code radix} is either smaller than {@link
 * java.lang.Character#MIN_RADIX} or larger than {@link
 * java.lang.Character#MAX_RADIX}.
 *
 * <li>Any character of the string is not a digit of the specified
 * radix, except that the first character may be a minus sign
 * {@code '-'} ({@code '\u005Cu002d'}) or plus sign {@code
 * '+'} ({@code '\u005Cu002B'}) provided that the string is
 * longer than length 1.
 *
 * <li>The value represented by the string is not a value of type
 * {@code long}.
 * </ul>
 *
 * Examples:
 * <blockquote><pre>
 * parseLong("0", 10) returns 0L
 * parseLong("473", 10) returns 473L
 * parseLong("+42", 10) returns 42L
 * parseLong("-0", 10) returns 0L
 * parseLong("-FF", 16) returns -255L
 * parseLong("1100110", 2) returns 102L
 * parseLong("99", 8) throws a NumberFormatException
 * parseLong("Hazelnut", 10) throws a NumberFormatException
 * parseLong("Hazelnut", 36) returns 1356099454469L
 * </pre></blockquote>
 *
 * @param s the {@code String} containing the
 * {@code long} representation to be parsed.
 * @param radix the radix to be used while parsing {@code s}.
 * @return the {@code long} represented by the string argument in
 * the specified radix.
 * @throws NumberFormatException if the string does not contain a
 * parsable {@code long}.
 */
 public static long parseLong(String s, int radix)
 throws NumberFormatException
 {
 if (s == null) {
 throw new NumberFormatException("Cannot parse null string");
 }

 if (radix < Character.MIN_RADIX) {
 throw new NumberFormatException("radix " + radix +
 " less than Character.MIN_RADIX");
 }
 if (radix > Character.MAX_RADIX) {
 throw new NumberFormatException("radix " + radix +
 " greater than Character.MAX_RADIX");
 }

 boolean negative = false;
 int i = 0, len = s.length();
 long limit = -Long.MAX_VALUE;

 if (len > 0) {
 char firstChar = s.charAt(0);
 if (firstChar < '0') { // Possible leading "+" or "-"
 if (firstChar == '-') {
 negative = true;
 limit = Long.MIN_VALUE;
 } else if (firstChar != '+') {
 throw NumberFormatException.forInputString(s, radix);
 }

 if (len == 1) { // Cannot have lone "+" or "-"
 throw NumberFormatException.forInputString(s, radix);
 }
 i++;
 }
 long multmin = limit / radix;
 long result = 0;
 while (i < len) {
 // Accumulating negatively avoids surprises near MAX_VALUE
 int digit = Character.digit(s.charAt(i++),radix);
 if (digit < 0 || result < multmin) {
 throw NumberFormatException.forInputString(s, radix);
 }
 result *= radix;
 if (result < limit + digit) {
 throw NumberFormatException.forInputString(s, radix);
 }
 result -= digit;
 }
 return negative ? result : -result;
 } else {
 throw NumberFormatException.forInputString(s, radix);
 }
 }

 /**
 * Parses the {@link CharSequence} argument as a signed {@code long} in
 * the specified {@code radix}, beginning at the specified
 * {@code beginIndex} and extending to {@code endIndex - 1}.
 *
 * The method does not take steps to guard against the
 * {@code CharSequence} being mutated while parsing.
 *
 * @param s the {@code CharSequence} containing the {@code long}
 * representation to be parsed
 * @param beginIndex the beginning index, inclusive.
 * @param endIndex the ending index, exclusive.
 * @param radix the radix to be used while parsing {@code s}.
 * @return the signed {@code long} represented by the subsequence in
 * the specified radix.
 * @throws NullPointerException if {@code s} is null.
 * @throws IndexOutOfBoundsException if {@code beginIndex} is
 * negative, or if {@code beginIndex} is greater than
 * {@code endIndex} or if {@code endIndex} is greater than
 * {@code s.length()}.
 * @throws NumberFormatException if the {@code CharSequence} does not
 * contain a parsable {@code long} in the specified
 * {@code radix}, or if {@code radix} is either smaller than
 * {@link java.lang.Character#MIN_RADIX} or larger than
 * {@link java.lang.Character#MAX_RADIX}.
 * @since 9
 */
 public static long parseLong(CharSequence s, int beginIndex, int endIndex, int radix)
 throws NumberFormatException {
 Objects.requireNonNull(s);
 Objects.checkFromToIndex(beginIndex, endIndex, s.length());

 if (radix < Character.MIN_RADIX) {
 throw new NumberFormatException("radix " + radix +
 " less than Character.MIN_RADIX");
 }
 if (radix > Character.MAX_RADIX) {
 throw new NumberFormatException("radix " + radix +
 " greater than Character.MAX_RADIX");
 }

 boolean negative = false;
 int i = beginIndex;
 long limit = -Long.MAX_VALUE;

 if (i < endIndex) {
 char firstChar = s.charAt(i);
 if (firstChar < '0') { // Possible leading "+" or "-"
 if (firstChar == '-') {
 negative = true;
 limit = Long.MIN_VALUE;
 } else if (firstChar != '+') {
 throw NumberFormatException.forCharSequence(s, beginIndex,
 endIndex, i);
 }
 i++;
 }
 if (i >= endIndex) { // Cannot have lone "+", "-" or ""
 throw NumberFormatException.forCharSequence(s, beginIndex,
 endIndex, i);
 }
 long multmin = limit / radix;
 long result = 0;
 while (i < endIndex) {
 // Accumulating negatively avoids surprises near MAX_VALUE
 int digit = Character.digit(s.charAt(i), radix);
 if (digit < 0 || result < multmin) {
 throw NumberFormatException.forCharSequence(s, beginIndex,
 endIndex, i);
 }
 result *= radix;
 if (result < limit + digit) {
 throw NumberFormatException.forCharSequence(s, beginIndex,
 endIndex, i);
 }
 i++;
 result -= digit;
 }
 return negative ? result : -result;
 } else {
 throw new NumberFormatException("");
 }
 }

 /**
 * Parses the string argument as a signed decimal {@code long}.
 * The characters in the string must all be decimal digits, except
 * that the first character may be an ASCII minus sign {@code '-'}
 * ({@code \u005Cu002D'}) to indicate a negative value or an
 * ASCII plus sign {@code '+'} ({@code '\u005Cu002B'}) to
 * indicate a positive value. The resulting {@code long} value is
 * returned, exactly as if the argument and the radix {@code 10}
 * were given as arguments to the {@link
 * #parseLong(java.lang.String, int)} method.
 *
 * Note that neither the character {@code L}
 * ({@code '\u005Cu004C'}) nor {@code l}
 * ({@code '\u005Cu006C'}) is permitted to appear at the end
 * of the string as a type indicator, as would be permitted in
 * Java programming language source code.
 *
 * @param s a {@code String} containing the {@code long}
 * representation to be parsed
 * @return the {@code long} represented by the argument in
 * decimal.
 * @throws NumberFormatException if the string does not contain a
 * parsable {@code long}.
 */
 public static long parseLong(String s) throws NumberFormatException {
 return parseLong(s, 10);
 }

 /**
 * Parses the string argument as an unsigned {@code long} in the
 * radix specified by the second argument. An unsigned integer
 * maps the values usually associated with negative numbers to
 * positive numbers larger than {@code MAX_VALUE}.
 *
 * The characters in the string must all be digits of the
 * specified radix (as determined by whether {@link
 * java.lang.Character#digit(char, int)} returns a nonnegative
 * value), except that the first character may be an ASCII plus
 * sign {@code '+'} ({@code '\u005Cu002B'}). The resulting
 * integer value is returned.
 *
 * An exception of type {@code NumberFormatException} is
 * thrown if any of the following situations occurs:
 * <ul>
 * <li>The first argument is {@code null} or is a string of
 * length zero.
 *
 * <li>The radix is either smaller than
 * {@link java.lang.Character#MIN_RADIX} or
 * larger than {@link java.lang.Character#MAX_RADIX}.
 *
 * <li>Any character of the string is not a digit of the specified
 * radix, except that the first character may be a plus sign
 * {@code '+'} ({@code '\u005Cu002B'}) provided that the
 * string is longer than length 1.
 *
 * <li>The value represented by the string is larger than the
 * largest unsigned {@code long}, 264-1.
 *
 * </ul>
 *
 *
 * @param s the {@code String} containing the unsigned integer
 * representation to be parsed
 * @param radix the radix to be used while parsing {@code s}.
 * @return the unsigned {@code long} represented by the string
 * argument in the specified radix.
 * @throws NumberFormatException if the {@code String}
 * does not contain a parsable {@code long}.
 * @since 1.8
 */
 public static long parseUnsignedLong(String s, int radix)
 throws NumberFormatException {
 if (s == null) {
 throw new NumberFormatException("Cannot parse null string");
 }

 int len = s.length();
 if (len > 0) {
 char firstChar = s.charAt(0);
 if (firstChar == '-') {
 throw new
 NumberFormatException(String.format("Illegal leading minus sign " +
 "on unsigned string %s.", s));
 } else {
 if (len <= 12 || // Long.MAX_VALUE in Character.MAX_RADIX is 13 digits
 (radix == 10 && len <= 18) ) { // Long.MAX_VALUE in base 10 is 19 digits
 return parseLong(s, radix);
 }

 // No need for range checks on len due to testing above.
 long first = parseLong(s, 0, len - 1, radix);
 int second = Character.digit(s.charAt(len - 1), radix);
 if (second < 0) {
 throw new NumberFormatException("Bad digit at end of " + s);
 }
 long result = first * radix + second;

 /*
 * Test leftmost bits of multiprecision extension of first*radix
 * for overflow. The number of bits needed is defined by
 * GUARD_BIT = ceil(log2(Character.MAX_RADIX)) + 1 = 7. Then
 * int guard = radix*(int)(first >>> (64 - GUARD_BIT)) and
 * overflow is tested by splitting guard in the ranges
 * guard < 92, 92 <= guard < 128, and 128 <= guard, where
 * 92 = 128 - Character.MAX_RADIX. Note that guard cannot take
 * on a value which does not include a prime factor in the legal
 * radix range.
 */
 int guard = radix * (int) (first >>> 57);
 if (guard >= 128 ||
 (result >= 0 && guard >= 128 - Character.MAX_RADIX)) {
 /*
 * For purposes of exposition, the programmatic statements
 * below should be taken to be multi-precision, i.e., not
 * subject to overflow.
 *
 * A) Condition guard >= 128:
 * If guard >= 128 then first*radix >= 2^7 * 2^57 = 2^64
 * hence always overflow.
 *
 * B) Condition guard < 92:
 * Define left7 = first >>> 57.
 * Given first = (left7 * 2^57) + (first & (2^57 - 1)) then
 * result <= (radix*left7)*2^57 + radix*(2^57 - 1) + second.
 * Thus if radix*left7 < 92, radix <= 36, and second < 36,
 * then result < 92*2^57 + 36*(2^57 - 1) + 36 = 2^64 hence
 * never overflow.
 *
 * C) Condition 92 <= guard < 128:
 * first*radix + second >= radix*left7*2^57 + second
 * so that first*radix + second >= 92*2^57 + 0 > 2^63
 *
 * D) Condition guard < 128:
 * radix*first <= (radix*left7) * 2^57 + radix*(2^57 - 1)
 * so
 * radix*first + second <= (radix*left7) * 2^57 + radix*(2^57 - 1) + 36
 * thus
 * radix*first + second < 128 * 2^57 + 36*2^57 - radix + 36
 * whence
 * radix*first + second < 2^64 + 2^6*2^57 = 2^64 + 2^63
 *
 * E) Conditions C, D, and result >= 0:
 * C and D combined imply the mathematical result
 * 2^63 < first*radix + second < 2^64 + 2^63. The lower
 * bound is therefore negative as a signed long, but the
 * upper bound is too small to overflow again after the
 * signed long overflows to positive above 2^64 - 1. Hence
 * result >= 0 implies overflow given C and D.
 */
 throw new NumberFormatException(String.format("String value %s exceeds " +
 "range of unsigned long.", s));
 }
 return result;
 }
 } else {
 throw NumberFormatException.forInputString(s, radix);
 }
 }

 /**
 * Parses the {@link CharSequence} argument as an unsigned {@code long} in
 * the specified {@code radix}, beginning at the specified
 * {@code beginIndex} and extending to {@code endIndex - 1}.
 *
 * The method does not take steps to guard against the
 * {@code CharSequence} being mutated while parsing.
 *
 * @param s the {@code CharSequence} containing the unsigned
 * {@code long} representation to be parsed
 * @param beginIndex the beginning index, inclusive.
 * @param endIndex the ending index, exclusive.
 * @param radix the radix to be used while parsing {@code s}.
 * @return the unsigned {@code long} represented by the subsequence in
 * the specified radix.
 * @throws NullPointerException if {@code s} is null.
 * @throws IndexOutOfBoundsException if {@code beginIndex} is
 * negative, or if {@code beginIndex} is greater than
 * {@code endIndex} or if {@code endIndex} is greater than
 * {@code s.length()}.
 * @throws NumberFormatException if the {@code CharSequence} does not
 * contain a parsable unsigned {@code long} in the specified
 * {@code radix}, or if {@code radix} is either smaller than
 * {@link java.lang.Character#MIN_RADIX} or larger than
 * {@link java.lang.Character#MAX_RADIX}.
 * @since 9
 */
 public static long parseUnsignedLong(CharSequence s, int beginIndex, int endIndex, int radix)
 throws NumberFormatException {
 Objects.requireNonNull(s);
 Objects.checkFromToIndex(beginIndex, endIndex, s.length());

 int start = beginIndex, len = endIndex - beginIndex;

 if (len > 0) {
 char firstChar = s.charAt(start);
 if (firstChar == '-') {
 throw new NumberFormatException(String.format("Illegal leading minus sign " +
 "on unsigned string %s.", s.subSequence(start, start + len)));
 } else {
 if (len <= 12 || // Long.MAX_VALUE in Character.MAX_RADIX is 13 digits
 (radix == 10 && len <= 18) ) { // Long.MAX_VALUE in base 10 is 19 digits
 return parseLong(s, start, start + len, radix);
 }

 // No need for range checks on end due to testing above.
 long first = parseLong(s, start, start + len - 1, radix);
 int second = Character.digit(s.charAt(start + len - 1), radix);
 if (second < 0) {
 throw new NumberFormatException("Bad digit at end of " +
 s.subSequence(start, start + len));
 }
 long result = first * radix + second;

 /*
 * Test leftmost bits of multiprecision extension of first*radix
 * for overflow. The number of bits needed is defined by
 * GUARD_BIT = ceil(log2(Character.MAX_RADIX)) + 1 = 7. Then
 * int guard = radix*(int)(first >>> (64 - GUARD_BIT)) and
 * overflow is tested by splitting guard in the ranges
 * guard < 92, 92 <= guard < 128, and 128 <= guard, where
 * 92 = 128 - Character.MAX_RADIX. Note that guard cannot take
 * on a value which does not include a prime factor in the legal
 * radix range.
 */
 int guard = radix * (int) (first >>> 57);
 if (guard >= 128 ||
 (result >= 0 && guard >= 128 - Character.MAX_RADIX)) {
 /*
 * For purposes of exposition, the programmatic statements
 * below should be taken to be multi-precision, i.e., not
 * subject to overflow.
 *
 * A) Condition guard >= 128:
 * If guard >= 128 then first*radix >= 2^7 * 2^57 = 2^64
 * hence always overflow.
 *
 * B) Condition guard < 92:
 * Define left7 = first >>> 57.
 * Given first = (left7 * 2^57) + (first & (2^57 - 1)) then
 * result <= (radix*left7)*2^57 + radix*(2^57 - 1) + second.
 * Thus if radix*left7 < 92, radix <= 36, and second < 36,
 * then result < 92*2^57 + 36*(2^57 - 1) + 36 = 2^64 hence
 * never overflow.
 *
 * C) Condition 92 <= guard < 128:
 * first*radix + second >= radix*left7*2^57 + second
 * so that first*radix + second >= 92*2^57 + 0 > 2^63
 *
 * D) Condition guard < 128:
 * radix*first <= (radix*left7) * 2^57 + radix*(2^57 - 1)
 * so
 * radix*first + second <= (radix*left7) * 2^57 + radix*(2^57 - 1) + 36
 * thus
 * radix*first + second < 128 * 2^57 + 36*2^57 - radix + 36
 * whence
 * radix*first + second < 2^64 + 2^6*2^57 = 2^64 + 2^63
 *
 * E) Conditions C, D, and result >= 0:
 * C and D combined imply the mathematical result
 * 2^63 < first*radix + second < 2^64 + 2^63. The lower
 * bound is therefore negative as a signed long, but the
 * upper bound is too small to overflow again after the
 * signed long overflows to positive above 2^64 - 1. Hence
 * result >= 0 implies overflow given C and D.
 */
 throw new NumberFormatException(String.format("String value %s exceeds " +
 "range of unsigned long.", s.subSequence(start, start + len)));
 }
 return result;
 }
 } else {
 throw NumberFormatException.forInputString("", radix);
 }
 }

 /**
 * Parses the string argument as an unsigned decimal {@code long}. The
 * characters in the string must all be decimal digits, except
 * that the first character may be an ASCII plus sign {@code
 * '+'} ({@code '\u005Cu002B'}). The resulting integer value
 * is returned, exactly as if the argument and the radix 10 were
 * given as arguments to the {@link
 * #parseUnsignedLong(java.lang.String, int)} method.
 *
 * @param s a {@code String} containing the unsigned {@code long}
 * representation to be parsed
 * @return the unsigned {@code long} value represented by the decimal string argument
 * @throws NumberFormatException if the string does not contain a
 * parsable unsigned integer.
 * @since 1.8
 */
 public static long parseUnsignedLong(String s) throws NumberFormatException {
 return parseUnsignedLong(s, 10);
 }

 /**
 * Returns a {@code Long} object holding the value
 * extracted from the specified {@code String} when parsed
 * with the radix given by the second argument. The first
 * argument is interpreted as representing a signed
 * {@code long} in the radix specified by the second
 * argument, exactly as if the arguments were given to the {@link
 * #parseLong(java.lang.String, int)} method. The result is a
 * {@code Long} object that represents the {@code long}
 * value specified by the string.
 *
 * In other words, this method returns a {@code Long} object equal
 * to the value of:
 *
 * <blockquote>
 * {@code Long.valueOf(Long.parseLong(s, radix))}
 * </blockquote>
 *
 * @param s the string to be parsed
 * @param radix the radix to be used in interpreting {@code s}
 * @return a {@code Long} object holding the value
 * represented by the string argument in the specified
 * radix.
 * @throws NumberFormatException If the {@code String} does not
 * contain a parsable {@code long}.
 */
 public static Long valueOf(String s, int radix) throws NumberFormatException {
 return Long.valueOf(parseLong(s, radix));
 }

 /**
 * Returns a {@code Long} object holding the value
 * of the specified {@code String}. The argument is
 * interpreted as representing a signed decimal {@code long},
 * exactly as if the argument were given to the {@link
 * #parseLong(java.lang.String)} method. The result is a
 * {@code Long} object that represents the integer value
 * specified by the string.
 *
 * In other words, this method returns a {@code Long} object
 * equal to the value of:
 *
 * <blockquote>
 * {@code Long.valueOf(Long.parseLong(s))}
 * </blockquote>
 *
 * @param s the string to be parsed.
 * @return a {@code Long} object holding the value
 * represented by the string argument.
 * @throws NumberFormatException If the string cannot be parsed
 * as a {@code long}.
 */
 public static Long valueOf(String s) throws NumberFormatException
 {
 return Long.valueOf(parseLong(s, 10));
 }

 private static class LongCache {
 private LongCache() {}

 static final Long[] cache;
 static Long[] archivedCache;

 static {
 int size = -(-128) + 127 + 1;

 // Load and use the archived cache if it exists
 CDS.initializeFromArchive(LongCache.class);
 if (archivedCache == null || archivedCache.length != size) {
 Long[] c = new Long[size];
 long value = -128;
 for(int i = 0; i < size; i++) {
 c[i] = new Long(value++);
 }
 archivedCache = c;
 }
 cache = archivedCache;
 }
 }

 /**
 * Returns a {@code Long} instance representing the specified
 * {@code long} value.
 * If a new {@code Long} instance is not required, this method
 * should generally be used in preference to the constructor
 * {@link #Long(long)}, as this method is likely to yield
 * significantly better space and time performance by caching
 * frequently requested values.
 *
 * This method will always cache values in the range -128 to 127,
 * inclusive, and may cache other values outside of this range.
 *
 * @param l a long value.
 * @return a {@code Long} instance representing {@code l}.
 * @since 1.5
 */
 @IntrinsicCandidate
 public static Long valueOf(long l) {
 final int offset = 128;
 if (l >= -128 && l <= 127) { // will cache
 return LongCache.cache[(int)l + offset];
 }
 return new Long(l);
 }

 /**
 * Decodes a {@code String} into a {@code Long}.
 * Accepts decimal, hexadecimal, and octal numbers given by the
 * following grammar:
 *
 * <blockquote>
 * <dl>
 * <dt>DecodableString:
 * <dd>Signopt DecimalNumeral
 * <dd>Signopt {@code 0x} HexDigits
 * <dd>Signopt {@code 0X} HexDigits
 * <dd>Signopt {@code #} HexDigits
 * <dd>Signopt {@code 0} OctalDigits
 *
 * <dt>Sign:
 * <dd>{@code -}
 * <dd>{@code +}
 * </dl>
 * </blockquote>
 *
 * DecimalNumeral, HexDigits, and OctalDigits
 * are as defined in section {@jls 3.10.1} of
 * <cite>The Java Language Specification</cite>,
 * except that underscores are not accepted between digits.
 *
 * The sequence of characters following an optional
 * sign and/or radix specifier ("{@code 0x}", "{@code 0X}",
 * "{@code #}", or leading zero) is parsed as by the {@code
 * Long.parseLong} method with the indicated radix (10, 16, or 8).
 * This sequence of characters must represent a positive value or
 * a {@link NumberFormatException} will be thrown. The result is
 * negated if first character of the specified {@code String} is
 * the minus sign. No whitespace characters are permitted in the
 * {@code String}.
 *
 * @param nm the {@code String} to decode.
 * @return a {@code Long} object holding the {@code long}
 * value represented by {@code nm}
 * @throws NumberFormatException if the {@code String} does not
 * contain a parsable {@code long}.
 * @see java.lang.Long#parseLong(String, int)
 * @since 1.2
 */
 public static Long decode(String nm) throws NumberFormatException {
 int radix = 10;
 int index = 0;
 boolean negative = false;
 long result;

 if (nm.isEmpty())
 throw new NumberFormatException("Zero length string");
 char firstChar = nm.charAt(0);
 // Handle sign, if present
 if (firstChar == '-') {
 negative = true;
 index++;
 } else if (firstChar == '+')
 index++;

 // Handle radix specifier, if present
 if (nm.startsWith("0x", index) || nm.startsWith("0X", index)) {
 index += 2;
 radix = 16;
 }
 else if (nm.startsWith("#", index)) {
 index ++;
 radix = 16;
 }
 else if (nm.startsWith("0", index) && nm.length() > 1 + index) {
 index ++;
 radix = 8;
 }

 if (nm.startsWith("-", index) || nm.startsWith("+", index))
 throw new NumberFormatException("Sign character in wrong position");

 try {
 result = parseLong(nm, index, nm.length(), radix);
 result = negative ? -result : result;
 } catch (NumberFormatException e) {
 // If number is Long.MIN_VALUE, we'll end up here. The next line
 // handles this case, and causes any genuine format error to be
 // rethrown.
 String constant = negative ? ("-" + nm.substring(index))
 : nm.substring(index);
 result = parseLong(constant, radix);
 }
 return result;
 }

 /**
 * The value of the {@code Long}.
 *
 * @serial
 */
 private final long value;

 /**
 * Constructs a newly allocated {@code Long} object that
 * represents the specified {@code long} argument.
 *
 * @param value the value to be represented by the
 * {@code Long} object.
 *
 * @deprecated
 * It is rarely appropriate to use this constructor. The static factory
 * {@link #valueOf(long)} is generally a better choice, as it is
 * likely to yield significantly better space and time performance.
 */
 @Deprecated(since="9", forRemoval = true)
 public Long(long value) {
 this.value = value;
 }

 /**
 * Constructs a newly allocated {@code Long} object that
 * represents the {@code long} value indicated by the
 * {@code String} parameter. The string is converted to a
 * {@code long} value in exactly the manner used by the
 * {@code parseLong} method for radix 10.
 *
 * @param s the {@code String} to be converted to a
 * {@code Long}.
 * @throws NumberFormatException if the {@code String} does not
 * contain a parsable {@code long}.
 *
 * @deprecated
 * It is rarely appropriate to use this constructor.
 * Use {@link #parseLong(String)} to convert a string to a
 * {@code long} primitive, or use {@link #valueOf(String)}
 * to convert a string to a {@code Long} object.
 */
 @Deprecated(since="9", forRemoval = true)
 public Long(String s) throws NumberFormatException {
 this.value = parseLong(s, 10);
 }

 /**
 * Returns the value of this {@code Long} as a {@code byte} after
 * a narrowing primitive conversion.
 * @jls 5.1.3 Narrowing Primitive Conversion
 */
 public byte byteValue() {
 return (byte)value;
 }

 /**
 * Returns the value of this {@code Long} as a {@code short} after
 * a narrowing primitive conversion.
 * @jls 5.1.3 Narrowing Primitive Conversion
 */
 public short shortValue() {
 return (short)value;
 }

 /**
 * Returns the value of this {@code Long} as an {@code int} after
 * a narrowing primitive conversion.
 * @jls 5.1.3 Narrowing Primitive Conversion
 */
 public int intValue() {
 return (int)value;
 }

 /**
 * Returns the value of this {@code Long} as a
 * {@code long} value.
 */
 @IntrinsicCandidate
 public long longValue() {
 return value;
 }

 /**
 * Returns the value of this {@code Long} as a {@code float} after
 * a widening primitive conversion.
 * @jls 5.1.2 Widening Primitive Conversion
 */
 public float floatValue() {
 return (float)value;
 }

 /**
 * Returns the value of this {@code Long} as a {@code double}
 * after a widening primitive conversion.
 * @jls 5.1.2 Widening Primitive Conversion
 */
 public double doubleValue() {
 return (double)value;
 }

 /**
 * Returns a {@code String} object representing this
 * {@code Long}'s value. The value is converted to signed
 * decimal representation and returned as a string, exactly as if
 * the {@code long} value were given as an argument to the
 * {@link java.lang.Long#toString(long)} method.
 *
 * @return a string representation of the value of this object in
 * base 10.
 */
 public String toString() {
 return toString(value);
 }

 /**
 * Returns a hash code for this {@code Long}. The result is
 * the exclusive OR of the two halves of the primitive
 * {@code long} value held by this {@code Long}
 * object. That is, the hashcode is the value of the expression:
 *
 * <blockquote>
 * {@code (int)(this.longValue()^(this.longValue()>>>32))}
 * </blockquote>
 *
 * @return a hash code value for this object.
 */
 @Override
 public int hashCode() {
 return Long.hashCode(value);
 }

 /**
 * Returns a hash code for a {@code long} value; compatible with
 * {@code Long.hashCode()}.
 *
 * @param value the value to hash
 * @return a hash code value for a {@code long} value.
 * @since 1.8
 */
 public static int hashCode(long value) {
 return (int)(value ^ (value >>> 32));
 }

 /**
 * Compares this object to the specified object. The result is
 * {@code true} if and only if the argument is not
 * {@code null} and is a {@code Long} object that
 * contains the same {@code long} value as this object.
 *
 * @param obj the object to compare with.
 * @return {@code true} if the objects are the same;
 * {@code false} otherwise.
 */
 public boolean equals(Object obj) {
 if (obj instanceof Long) {
 return value == ((Long)obj).longValue();
 }
 return false;
 }

 /**
 * Determines the {@code long} value of the system property
 * with the specified name.
 *
 * The first argument is treated as the name of a system
 * property. System properties are accessible through the {@link
 * java.lang.System#getProperty(java.lang.String)} method. The
 * string value of this property is then interpreted as a {@code
 * long} value using the grammar supported by {@link Long#decode decode}
 * and a {@code Long} object representing this value is returned.
 *
 * If there is no property with the specified name, if the
 * specified name is empty or {@code null}, or if the property
 * does not have the correct numeric format, then {@code null} is
 * returned.
 *
 * In other words, this method returns a {@code Long} object
 * equal to the value of:
 *
 * <blockquote>
 * {@code getLong(nm, null)}
 * </blockquote>
 *
 * @param nm property name.
 * @return the {@code Long} value of the property.
 * @throws SecurityException for the same reasons as
 * {@link System#getProperty(String) System.getProperty}
 * @see java.lang.System#getProperty(java.lang.String)
 * @see java.lang.System#getProperty(java.lang.String, java.lang.String)
 */
 public static Long getLong(String nm) {
 return getLong(nm, null);
 }

 /**
 * Determines the {@code long} value of the system property
 * with the specified name.
 *
 * The first argument is treated as the name of a system
 * property. System properties are accessible through the {@link
 * java.lang.System#getProperty(java.lang.String)} method. The
 * string value of this property is then interpreted as a {@code
 * long} value using the grammar supported by {@link Long#decode decode}
 * and a {@code Long} object representing this value is returned.
 *
 * The second argument is the default value. A {@code Long} object
 * that represents the value of the second argument is returned if there
 * is no property of the specified name, if the property does not have
 * the correct numeric format, or if the specified name is empty or null.
 *
 * In other words, this method returns a {@code Long} object equal
 * to the value of:
 *
 * <blockquote>
 * {@code getLong(nm, Long.valueOf(val))}
 * </blockquote>
 *
 * but in practice it may be implemented in a manner such as:
 *
 * <blockquote><pre>
 * Long result = getLong(nm, null);
 * return (result == null) ? Long.valueOf(val) : result;
 * </pre></blockquote>
 *
 * to avoid the unnecessary allocation of a {@code Long} object when
 * the default value is not needed.
 *
 * @param nm property name.
 * @param val default value.
 * @return the {@code Long} value of the property.
 * @throws SecurityException for the same reasons as
 * {@link System#getProperty(String) System.getProperty}
 * @see java.lang.System#getProperty(java.lang.String)
 * @see java.lang.System#getProperty(java.lang.String, java.lang.String)
 */
 public static Long getLong(String nm, long val) {
 Long result = Long.getLong(nm, null);
 return (result == null) ? Long.valueOf(val) : result;
 }

 /**
 * Returns the {@code long} value of the system property with
 * the specified name. The first argument is treated as the name
 * of a system property. System properties are accessible through
 * the {@link java.lang.System#getProperty(java.lang.String)}
 * method. The string value of this property is then interpreted
 * as a {@code long} value, as per the
 * {@link Long#decode decode} method, and a {@code Long} object
 * representing this value is returned; in summary:
 *
 * <ul>
 * <li>If the property value begins with the two ASCII characters
 * {@code 0x} or the ASCII character {@code #}, not followed by
 * a minus sign, then the rest of it is parsed as a hexadecimal integer
 * exactly as for the method {@link #valueOf(java.lang.String, int)}
 * with radix 16.
 * <li>If the property value begins with the ASCII character
 * {@code 0} followed by another character, it is parsed as
 * an octal integer exactly as by the method {@link
 * #valueOf(java.lang.String, int)} with radix 8.
 * <li>Otherwise the property value is parsed as a decimal
 * integer exactly as by the method
 * {@link #valueOf(java.lang.String, int)} with radix 10.
 * </ul>
 *
 * Note that, in every case, neither {@code L}
 * ({@code '\u005Cu004C'}) nor {@code l}
 * ({@code '\u005Cu006C'}) is permitted to appear at the end
 * of the property value as a type indicator, as would be
 * permitted in Java programming language source code.
 *
 * The second argument is the default value. The default value is
 * returned if there is no property of the specified name, if the
 * property does not have the correct numeric format, or if the
 * specified name is empty or {@code null}.
 *
 * @param nm property name.
 * @param val default value.
 * @return the {@code Long} value of the property.
 * @throws SecurityException for the same reasons as
 * {@link System#getProperty(String) System.getProperty}
 * @see System#getProperty(java.lang.String)
 * @see System#getProperty(java.lang.String, java.lang.String)
 */
 public static Long getLong(String nm, Long val) {
 String v = null;
 try {
 v = System.getProperty(nm);
 } catch (IllegalArgumentException | NullPointerException e) {
 }
 if (v != null) {
 try {
 return Long.decode(v);
 } catch (NumberFormatException e) {
 }
 }
 return val;
 }

 /**
 * Compares two {@code Long} objects numerically.
 *
 * @param anotherLong the {@code Long} to be compared.
 * @return the value {@code 0} if this {@code Long} is
 * equal to the argument {@code Long}; a value less than
 * {@code 0} if this {@code Long} is numerically less
 * than the argument {@code Long}; and a value greater
 * than {@code 0} if this {@code Long} is numerically
 * greater than the argument {@code Long} (signed
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