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摘要： enum Singleton { INSTANCE; public void m() { System.out.println("test"); } } 阅读全文

摘要： class Singleton { private static class SingletonInstance { private static final Singleton INSTANCE = new Singleton(); } private Singleton() { } public 阅读全文

摘要： class Singleton { private static volatile Singleton instance; private Singleton() { } public static Singleton getInstance() { if (instance == null) { 阅读全文

摘要： 线程不安全 class Singleton { private Singleton() { } private static Singleton instance; public static Singleton getInstance() { if (instance == null) { ins 阅读全文

摘要： 静态变量 class Singleton { private static final Singleton instance = new Singleton(); private Singleton() { } public static Singleton getInstance() { retu 阅读全文