concurrent-01(线程安全单例模式)

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线程安全单例的三种实现方式

1、饿汉式（未实现懒加载）

public class singleton{    private static Singleton singleton = new Singleton();    private Singleton(){}    public static Singleton getInstance(){        return singleton;    }}

2、懒汉式（实现懒加载）

public class singleton{    private static Singleton singleton;    private Singleton(){}    public static Singleton getInstance(){        if（singleton == null）{            synchronized(Singleton.class){                if(singleton == null){                    singleton = new Singleton();                }            }        }        return singleton;    }}

3、静态内部类（实现懒加载）

public class Singleton{    private Singleton(){}    private static class Inner(){        private static Singleton singleton = new Singleton();    }    public static Singleton getInstance(){        return Inner.singleton;    }}

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