题解 | 创建单例对象

public class Main {

    public static void main(String[] args) {
        Singleton s1 = Singleton.getInstance();
        Singleton s2 = Singleton.getInstance();
        System.out.println(s1 == s2);
    }

}

class Singleton {

    private static Singleton instance;

    private Singleton() {

    }

    //write your code here......

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

}

题目分析与代码解析：