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5 Ways to Implement Singleton in Java

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5 Ways to Implement Singleton in Java

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      常用的五种 Java 单例(Singleton)模式实现方式,结合实际情况选用 Hungry (饿汉式) 线程安全,调用效率高,不可延时加载 1public class Singleton { 2 private static Singleton instance = new Singleton; 3 private Singleton() {} 4 public static Singleton getInstance() { 5 return instance; 6 } 7} 这是单例模式中最简单的一种实现方式,但是存在非常明显的问题,单例还没有使用的时候就已经被初始化,也就是哪怕程序从头到尾都没使用这个单例,单例的对象还是会被创建,造成不必要的资源浪费 Lazy (懒汉式) 线程安全,调用效率不高,可延时加载 1public class Singleton { 2 private static Singleton instance; 3 private Singleton() {} 4 public static synchronized Singleton getInstance() { 5 if(instance == null) { 6 instance = new Singleton(); 7 } 8 return instance; 9 } 10} 类初始化时不会初始化对象实例,实现了延时加载,但是公开方法同步加载,所以调用效率低
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      5 Ways to Implement Singleton in Java
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      常用的五种 Java 单例(Singleton)模式实现方式,结合实际情况选用 Hungry (饿汉式) 线程安全,调用效率高,不可延时加载 1public class Singleton { 2 private static Singleton instance = new Singleton; 3 private Singleton() {} 4 public static Singleton getInstance() { 5 return instance; 6 } 7} 这是单例模式中最简单的一种实现方式,但是存在非常明显的问题,单例还没有使用的时候就已经被初始化,也就是哪怕程序从头到尾都没使用这个单例,单例的对象还是会被创建,造成不必要的资源浪费 Lazy (懒汉式) 线程安全,调用效率不高,可延时加载 1public class Singleton { 2 private static Singleton instance; 3 private Singleton() {} 4 public static synchronized Singleton getInstance() { 5 if(instance == null) { 6 instance = new Singleton(); 7 } 8 return instance; 9 } 10} 类初始化时不会初始化对象实例,实现了延时加载,但是公开方法同步加载,所以调用效率低
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