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import java.util.*; public class WeakHashMap_Demo { private static Map map; public static void main (String args[]) { map = new WeakHashMap(); map.put(new String("Maine"), "Augusta"); Runnable runner = new Runnable() { public void run() { while (map.containsKey("Maine")) { try { Thread.sleep(500); } catch (InterruptedException ignored) { } System.out.println("Thread waiting"); System.gc(); } } }; Thread t = new Thread(runner); t.start(); System.out.println("Main waiting"); try { t.join(); } catch (InterruptedException ignored) { } } }
运行结果 :
正在执行...
