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JRE 8 rt.jar - com.* Package Source Code
JRE 8 rt.jar is the JAR file for JRE 8 RT (Runtime) libraries. JRE (Java Runtime) 8 is the runtime environment included in JDK 8. JRE 8 rt.jar libraries are divided into 6 packages:
com.* - Internal Oracle and Sun Microsystems libraries java.* - Standard Java API libraries. javax.* - Extended Java API libraries. jdk.* - JDK supporting libraries. org.* - Third party libraries. sun.* - Old libraries developed by Sun Microsystems.
JAR File Information:
Directory of C:\fyicenter\jdk-1.8.0_191\jre\lib 63,596,151 rt.jar
Here is the list of Java classes of the com.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.
✍: FYIcenter
⏎ com/sun/jmx/mbeanserver/WeakIdentityHashMap.java
/* * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * * * * * * * * * * * * * * * * * * * * */ package com.sun.jmx.mbeanserver; import static com.sun.jmx.mbeanserver.Util.*; import java.lang.ref.Reference; import java.lang.ref.ReferenceQueue; import java.lang.ref.WeakReference; import java.util.Map; /** * <p>A map where keys are compared using identity comparison (like * IdentityHashMap) but where the presence of an object as a key in * the map does not prevent it being garbage collected (like * WeakHashMap). This class does not implement the Map interface * because it is difficult to ensure correct semantics for iterators * over the entrySet().</p> * * <p>Because we do not implement Map, we do not copy the questionable * interface where you can call get(k) or remove(k) for any type of k, * which of course can only have an effect if k is of type K.</p> * * <p>This map does not support null keys.</p> */ /* * The approach * is to wrap each key in a WeakReference and use the wrapped value as * a key in an ordinary HashMap. The WeakReference has to be a * subclass IdentityWeakReference (IWR) where two IWRs are equal if * they refer to the same object. This enables us to find the entry * again. */ class WeakIdentityHashMap<K, V> { private WeakIdentityHashMap() {} static <K, V> WeakIdentityHashMap<K, V> make() { return new WeakIdentityHashMap<K, V>(); } V get(K key) { expunge(); WeakReference<K> keyref = makeReference(key); return map.get(keyref); } public V put(K key, V value) { expunge(); if (key == null) throw new IllegalArgumentException("Null key"); WeakReference<K> keyref = makeReference(key, refQueue); return map.put(keyref, value); } public V remove(K key) { expunge(); WeakReference<K> keyref = makeReference(key); return map.remove(keyref); } private void expunge() { Reference<? extends K> ref; while ((ref = refQueue.poll()) != null) map.remove(ref); } private WeakReference<K> makeReference(K referent) { return new IdentityWeakReference<K>(referent); } private WeakReference<K> makeReference(K referent, ReferenceQueue<K> q) { return new IdentityWeakReference<K>(referent, q); } /** * WeakReference where equals and hashCode are based on the * referent. More precisely, two objects are equal if they are * identical or if they both have the same non-null referent. The * hashCode is the value the original referent had. Even if the * referent is cleared, the hashCode remains. Thus, objects of * this class can be used as keys in hash-based maps and sets. */ private static class IdentityWeakReference<T> extends WeakReference<T> { IdentityWeakReference(T o) { this(o, null); } IdentityWeakReference(T o, ReferenceQueue<T> q) { super(o, q); this.hashCode = (o == null) ? 0 : System.identityHashCode(o); } public boolean equals(Object o) { if (this == o) return true; if (!(o instanceof IdentityWeakReference<?>)) return false; IdentityWeakReference<?> wr = (IdentityWeakReference<?>) o; Object got = get(); return (got != null && got == wr.get()); } public int hashCode() { return hashCode; } private final int hashCode; } private Map<WeakReference<K>, V> map = newMap(); private ReferenceQueue<K> refQueue = new ReferenceQueue<K>(); }
⏎ com/sun/jmx/mbeanserver/WeakIdentityHashMap.java
Or download all of them as a single archive file:
File name: jre-rt-com-1.8.0_191-src.zip File size: 8099783 bytes Release date: 2018-10-28 Download
⇒ Backup JDK 8 Installation Directory
2023-02-07, 252135👍, 3💬
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