单例模式
Posted Tianyiya H.T.W
tags:
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应用
- 各种Manager
- 各种Factory
单例模式
饿汉
public class Singleton
private static final Singleton INSTANCE = new Singleton();
private Singleton()
private static Singleton getInstance()
return INSTANCE;
懒汉
public class Singleton
private static Singleton INSTANCE;
private Singleton()
private static synchronized Singleton getInstance()
if (INSTANCE == null)
INSTANCE = new Singleton();
return INSTANCE;
懒汉（双重检锁）
public class Singleton
private static volatile Singleton INSTANCE;
private Singleton()
private static Singleton getInstance()
if (INSTANCE == null)
synchronized (Singleton.class)
if (INSTANCE == null)
INSTANCE = new Singleton();
return INSTANCE;
静态内部类
public class Singleton
private static class Holder
private static final Singleton INSTANCE = new Singleton();
private Singleton()
private static Singleton getInstance()
return Holder.INSTANCE;
枚举
public enum Singleton
INSTANCE;
private static Singleton getInstance()
return INSTANCE;
保护单例
防止序列化
private Object readResolve()
return getInstance();
防止反射
构造器中加入反射拦截代码
心之所向，素履以往 生如逆旅，一苇以航
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