java单例模式，

java单例模式，

//登记式单例
public class Singleton{
private static class Single{
private static value = new Singleton();
}
public Singleton getInstance(){
return new Singleton();
}
}

// 懒汉式单例

public class Singleton{
private static Singleton instance = null;

public Singleton getInstance(){
    if(install == null){
        instance = new Singleton();
    }
    return instance;
}

}

//饿汉式单例
public class Singleton{
private static Singleton instance = new Singleton();

public Singleton getInstance(){
    return new instance;
}

}

//饱汉式安全单例
public class Singleton{
private static Singleton instance = null;

publice Singleton getInstance(){
    synchronized(Singleton.class){
        if(instance == null){
            instance = new Singleton();
        }
    }

    return instance;
}

}

//饿汉式安全单例
public class Singleton{
private static Singleton instance = new Singleton();

publice Synchronize Singleton getInstance(){
    return instance;
}

}