java 单例模式

package javalearn;

public class SingleInstance {
    private volatile static SingleInstance instance;
    private SingleInstance(){

    }
    public static SingleInstance getInstance(){
        if (instance==null){
            synchronized(SingleInstance.class){
                if (instance==null){
                    instance = new SingleInstance();
                }
            }
        }
        return instance;
    }

}

标签：java,模式,instance,SingleInstance,static,private,单例,null,class
来源： https://www.cnblogs.com/zheng123/p/11187988.html