黑马程序员 java基础Thread随笔

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public class ThreadTest6 {


/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub


}


}


/**
 * 饿汉试
 */
class Single {
private static final Single instance = new Single();


public static Single getInstance() {
return instance;
}
}


/**
 * 懒汉式 延迟加载的单例实例 多线程重的
 * 
 * @author lazy
 * 
 */
class Single1 {
private static Single1 s = null;


public static Single1 getInstance() {
if (s == null) {     //这里不在函数上 写synchroized
synchronized (Single.class) {
if (s == null)
s = new Single1();
}
}


return s;
}
}

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