package com.test;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.WeakHashMap;
public class Weakhashmap {
public static void main(String[] args) {
String a = new String("a");
String b = new String("b");
Map weakmap = new WeakHashMap();
Map map = new HashMap();
map.put(a, "aaa");
map.put(b, "bbb");
weakmap.put(a, "aaa");
weakmap.put(b, "bbb");
map.remove(a);
a=null;
b=null;
System.gc();
Iterator i = map.entrySet().iterator();
while (i.hasNext()) {
Map.Entry en = (Map.Entry)i.next();
System.out.println("map:"+en.getKey()+":"+en.getValue());
}
Iterator j = weakmap.entrySet().iterator();
while (j.hasNext()) {
Map.Entry en = (Map.Entry)j.next();
System.out.println("weakmap:"+en.getKey()+":"+en.getValue());
}
}
}
本文转自chainli 51CTO博客,原文链接:http://blog.51cto.com/lichen/1200455,如需转载请自行联系原作者