A simple singleton

//单例模式
public class Singleton {

    private static volatile Singleton singleton;

    private Singleton() {}//私有构造方法

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

 

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Origin blog.csdn.net/weixin_44232136/article/details/90764870