From 6ba7ed48f50f5ebb1d9568f8b010cee60a5fd480 Mon Sep 17 00:00:00 2001 From: bryce Date: Mon, 11 Dec 2000 03:47:48 +0000 Subject: * 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. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@38183 138bc75d-0d04-0410-961f-82ee72b054a4 --- libjava/java/lang/ref/PhantomReference.java | 62 +++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 libjava/java/lang/ref/PhantomReference.java (limited to 'libjava/java/lang/ref/PhantomReference.java') diff --git a/libjava/java/lang/ref/PhantomReference.java b/libjava/java/lang/ref/PhantomReference.java new file mode 100644 index 00000000000..7c07b52eccb --- /dev/null +++ b/libjava/java/lang/ref/PhantomReference.java @@ -0,0 +1,62 @@ +/* java.lang.ref.PhantomReference + 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 phantom reference is useful, to get notified, when an object got + * finalized. You can't access that object though, since it is + * finalized. This is the reason, why get() always + * returns null. + * + * @author Jochen Hoenicke + */ +public class PhantomReference + extends Reference +{ + /** + * Creates a new phantom reference. + * @param referent the object that should be watched. + * @param q the queue that should be notified, if the referent was + * finalized. This mustn't be null. + * @exception NullPointerException if q is null. + */ + public PhantomReference(Object referent, ReferenceQueue q) + { + super(referent, q); + } + + /** + * Returns the object, this reference refers to. + * @return null, since the refered object may be + * finalized and thus not accessible. + */ + public Object get() + { + return null; + } +} -- cgit v1.2.1