代码片段

2017-11-20 本文已影响4人康熙十八年

单例模式

//单例模式
public class SimpleDemo {
    private static  SimpleDemo instance;
    private SimpleDemo (){}
    public static SimpleDemo getInstance(){
        if (instance == null){
            synchronized (SimpleDemo.class){
                if (instance == null){
                    instance = new SimpleDemo();
                }
            }
        }
        return instance;
    }
}