单例模式

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单例模式：处理多线程的三种方法

1. 同步方法public class Singleton {    private static Singleton uniqueInstance;    private Singleton() {}    public static synchronized Singleton getInstance() {        if(uniqueInstance==null) {            uniqueInstance=new Singleton();        }        return uniqueInstance;    }}2. 创建"急切"实例public class Singleton {    private static Singleton uniqueInstance=new Singleton();    private Singleton() {}    public static Singleton getInstance() {        return uniquInstance;    }}3. 双重检查加锁public class Singleton {    private volatile* static Singleton uniqueInstance;    private Singleton() {}    public static Singleton getInstance() {        if(uniqueInstance==null) {            synchronized(Singleton.class) {                if(uniqueInstance==null) {                    uniqueInstance=new Singleton();                }            }        }        return uniqueInstance;    }}

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