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Makefile.am: Add HashSet.java and java/lang/ref classes.

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* Makefile.am: Add HashSet.java and java/lang/ref classes.
	Remove BasicMapEntry.java and Bucket.java.
	* Makefile.in: Rebuilt.
	* java/util/HashMap.java: Rewritten.
	* java/util/HashSet.java: Imported from classpath.
	* java/util/WeakHashMap.java: Imported from classpath.
	* java/util/Hashtable.java: Rewritten based on new HashMap code.
	* java/util/Bucket.java: Deleted.
	* java/util/BasicMapEntry.java: Deleted.
	* java/util/Collections.java (search): Use a for-loop, not iterator
	hasNext().
	(copy): Use a for-loop. Throw an IndexOutOfBoundsException if run out
	of elements in source.
	(max): Use a for-loop.
	(min): Ditto.
	(reverse): Keep track of positions instead of using Iterator's
	nextIndex() and previousIndex().
	(shuffle(List)): Initialize defaultRandom if required using
	double-check thread safety idiom. Call two-argument shuffle method
	using defaultRandom.
	(defaultRandom): New field.
	(shuffle(List, Random)): Use a for-loop. Keep track of pos instead
	of using previousIndex() and nextIndex().
	(singletonMap(iterator)): Use a HashMap.Entry, not BasicMapEntry.
	* java/util/AbstractCollection.java (toString): Use a StringBuffer.
	* java/util/AbstractMap.java (toString): Use StringBuffer.
	* java/lang/ref/PhantomReference.java: Imported from classpath.
	* java/lang/ref/SoftReference.java: Ditto.
	* java/lang/ref/Reference.java: Ditto.
	* java/lang/ref/WeakReference.java: Ditto.
	* java/lang/ref/ReferenceQueue.java: Ditto.

From-SVN: r38183
This commit is contained in:
Bryce McKinlay 2000-12-11 03:47:48 +00:00 • committed by Bryce McKinlay
parent a0932f7d1a
commit 488d42af6f
18 changed files with 2942 additions and 2062 deletions
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68
libjava/java/lang/ref/WeakReference.java Normal file
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/* java.lang.ref.WeakReference
Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath 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 for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
As a special exception, if you link this library with other files to
produce an executable, this library does not by itself cause the
resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why the
executable file might be covered by the GNU General Public License. */
package java.lang.ref;
/**
* A weak reference will be cleared, if the object is only weakly
* reachable. It is useful for lookup tables, where you aren't
* interested in an entry, if the key isn't reachable anymore.
* <code>WeakHashtable</code> is a complete implementation of such a
* table. <br>
*
* It is also useful to make objects unique: You create a set of weak
* references to those objects, and when you create a new object you
* look in this set, if the object already exists and return it. If
* an object is not referenced anymore, the reference will
* automatically cleared, and you may remove it from the set. <br>
*
* @author Jochen Hoenicke
* @see java.util.WeakHashtable
*/
public class WeakReference
extends Reference
{
/**
* Create a new weak reference, that is not registered to any queue.
* @param referent the object we refer to.
*/
public WeakReference(Object referent)
{
super(referent);
}
/**
* Create a new weak reference.
* @param referent the object we refer to.
* @param q the reference queue to register on.
* @exception NullPointerException if q is null.
*/
public WeakReference(Object referent, ReferenceQueue q)
{
super(referent, q);
}
}