aihiao的专栏

public class HungrySingletion { // 静态初始化器, 由JVM来保证线程安全 private final static HungrySingletion instance = new HungrySingletion(); private HungrySingletion() {} public static ...

public class HungryInnerSingletion { // 类级的静态的成员式内部类,该内部类的实例和外部类的实例没有绑定关系,而且只有被调用的时候才会被装载,从而实现了延迟加载 private static class Inner { // 静态初始化器, 由JVM来保证线程安全 private static H

public class TwiceJudgeNullLazySingleton { private static TwiceJudgeNullLazySingleton instance; public static TwiceJudgeNullLazySingleton getInstance(){ //第一次判空