code: // from gee.cs.oswego.edu/home/jsr166/jsr166
  
  package jsr166tests.jtreg.util.IdentityHashMap;
  
  /*
   * Copyright 2001-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
   * CA 95054 USA or visit www.sun.com if you need additional information or
   * have any questions.
   */
  
  /*
   * @test
   * @bug     4485486 6197726 6232484
   * @summary IdentityHashMap's entrySet toArray tests
   * @author  Josh Bloch, Martin Buchholz
   */
  
  import java.util.*;
  
  public class ToArray {
      public static void main(String[] args) {
          //----------------------------------------------------------------
          // new ArrayList(IdentityHashMap.entrySet())
          // used to return bogus entries.
          //----------------------------------------------------------------
          Map<String,String> mm = new IdentityHashMap<String,String>();
          mm.put("foo", "bar");
          mm.put("baz", "quux");
          List<Map.Entry<String,String>> lm
              = new ArrayList<Map.Entry<String,String>>(mm.entrySet());
          String s = lm.toString();
          if (! (s.equals("[foo=bar, baz=quux]") ||
                 s.equals("[baz=quux, foo=bar]")))
              throw new 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])
              throw new RuntimeException("Broken");
  
          mArray[0].toString();
          mArray[1].toString();
  
          //----------------------------------------------------------------
          // IdentityHashMap.entrySet().toArray(T[] a) used to simply
          // return toArray() !
          //----------------------------------------------------------------
          IdentityHashMap<Integer,Integer> map
              = new IdentityHashMap<Integer,Integer>();
          Set<Map.Entry<Integer,Integer>> es = map.entrySet();
          if (es.toArray().length != 0)
              throw new Error("non-empty");
          if (es.toArray(new Object[]{Boolean.TRUE})[0] != null)
              throw new Error("non-null");
          map.put(7,49);
          if (es.toArray().length != 1)
              throw new Error("length");
          Object[] x = es.toArray(new Object[]{Boolean.TRUE, Boolean.TRUE});
          if (x[1] != null)
              throw new Error("non-null");
          Map.Entry e = (Map.Entry) x[0];
          if (! e.getKey().equals(new Integer(7)))
              throw new Error("bad key");
          if (! e.getValue().equals(new Integer(49)))
              throw new Error("bad value");
      }
  }
  