Quelle IllegalLoadFactor.java Sprache: JAVA

/*
* Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/* @test
   @bug 4093817 4189594
   @summary Test for an illegalargumentexception on loadFactor
*/

import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;

/**
* This class tests to see if creating a hash table with an
* illegal value of loadFactor results in an IllegalArgumentException
*/
public class IllegalLoadFactor {

    public static void main(String[] args) throws Exception {
        boolean testSucceeded = false;
        try {
            // this should generate an IllegalArgumentException
            Hashtable bad1 = new Hashtable(100, -3);
        }
        catch (IllegalArgumentException e1) {
            testSucceeded = true;
        }
        if (!testSucceeded)
            throw new Exception("Hashtable, negative load factor");

        testSucceeded = false;
        try {
            // this should generate an IllegalArgumentException
            Hashtable bad1 = new Hashtable(100, Float.NaN);
        }
        catch (IllegalArgumentException e1) {
            testSucceeded = true;
        }
        if (!testSucceeded)
            throw new Exception("Hashtable, NaN load factor");

        testSucceeded = false;
        try {
            // this should generate an IllegalArgumentException
            HashMap bad1 = new HashMap(100, -3);
        }
        catch (IllegalArgumentException e1) {
            testSucceeded = true;
        }
        if (!testSucceeded)
            throw new Exception("HashMap, negative load factor");

        testSucceeded = false;
        try {
            // this should generate an IllegalArgumentException
            HashMap bad1 = new HashMap(100, Float.NaN);
        }
        catch (IllegalArgumentException e1) {
            testSucceeded = true;
        }
        if (!testSucceeded)
            throw new Exception("HashMap, NaN load factor");

        testSucceeded = false;
        try {
            // this should generate an IllegalArgumentException
            HashSet bad1 = new HashSet(100, -3);
        }
        catch (IllegalArgumentException e1) {
            testSucceeded = true;
        }
        if (!testSucceeded)
            throw new Exception("HashSet, negative load factor");

        testSucceeded = false;
        try {
            // this should generate an IllegalArgumentException
            HashSet bad1 = new HashSet(100, Float.NaN);
        }
        catch (IllegalArgumentException e1) {
            testSucceeded = true;
        }
        if (!testSucceeded)
            throw new Exception("HashSet, NaN load factor");

        testSucceeded = false;
        try {
            // this should generate an IllegalArgumentException
            WeakHashMap bad1 = new WeakHashMap(100, -3);
        }
        catch (IllegalArgumentException e1) {
            testSucceeded = true;
        }
        if (!testSucceeded)
            throw new Exception("WeakHashMap, negative load factor");

        testSucceeded = false;
        try {
            // this should generate an IllegalArgumentException
            WeakHashMap bad1 = new WeakHashMap(100, Float.NaN);
        }
        catch (IllegalArgumentException e1) {
            testSucceeded = true;
        }
        if (!testSucceeded)
            throw new Exception("WeakHashMap, NaN load factor");

        // Make sure that legal creates don't throw exceptions
        Map goodMap = new Hashtable(100, .69f);
        goodMap = new HashMap(100, .69f);
        Set goodSet = new HashSet(100, .69f);
        goodMap = new WeakHashMap(100, .69f);
    }
}

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