多线程Singleton模式笔记
单线程下安全使用的Singleton示例

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?多线程Singleton反模式——使用synchronized修饰方法
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class SingletonTestRunnable implements Runnable {public void run() {Singleton.getInstance();}}public class Singleton {private Singleton() {System.out.println("create instance.");}public static Singleton getInstance() {return Container.instance;}private static class Container {private static Singleton instance = new Singleton();}public static void main(String[] agrs) {new Thread(new SingletonTestRunnable()).start();new Thread(new SingletonTestRunnable()).start();}}
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--heipark
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