/* * Copyright (c) 2001, 2005, 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.
*/
publicclass ToArray { publicstaticvoid main(String[] args) { //---------------------------------------------------------------- // new ArrayList(IdentityHashMap.entrySet()) // used to return bogus entries. //----------------------------------------------------------------
Map<String,String> mm = new IdentityHashMap<>();
mm.put("foo", "bar");
mm.put("baz", "quux");
List<Map.Entry<String,String>> lm = new ArrayList<>(mm.entrySet());
String s = lm.toString(); if (! (s.equals("[foo=bar, baz=quux]") ||
s.equals("[baz=quux, foo=bar]"))) thrownew Error("bad string");
//---------------------------------------------------------------- // IdentityHashMap's lack of internal entry objects caused // the inherited (AbstractMap) version of toArray to // return garbage when called on the entrySet view. //----------------------------------------------------------------
Map m = new IdentityHashMap();
m.put("french", "connection");
m.put("polish", "sausage");
Object[] mArray = m.entrySet().toArray(); if (mArray[0] == mArray[1]) thrownew RuntimeException("Broken");
mArray[0].toString();
mArray[1].toString();
//---------------------------------------------------------------- // IdentityHashMap.entrySet().toArray(T[] a) used to simply // return toArray() ! //----------------------------------------------------------------
IdentityHashMap<Integer,Integer> map = new IdentityHashMap<>();
Set<Map.Entry<Integer,Integer>> es = map.entrySet(); if (es.toArray().length != 0) thrownew Error("non-empty"); if (es.toArray(new Object[]{Boolean.TRUE})[0] != null) thrownew Error("non-null");
map.put(7,49); if (es.toArray().length != 1) thrownew Error("length");
Object[] x = es.toArray(new Object[]{Boolean.TRUE, Boolean.TRUE}); if (x[1] != null) thrownew Error("non-null");
Map.Entry e = (Map.Entry) x[0]; if (! e.getKey().equals(new Integer(7))) thrownew Error("bad key"); if (! e.getValue().equals(new Integer(49))) thrownew Error("bad value");
}
}
Messung V0.5
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