写这段代码的人该不该被开除?

最新推荐文章于 2022-11-02 20:56:10 发布

原创最新推荐文章于 2022-11-02 20:56:10 发布 · 504 阅读

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#constructor #class #string

本文展示了一个使用Java实现的单例模式示例。通过一个名为Singleton的类来演示如何确保整个应用程序中只有一个实例存在，并提供一个全局访问点。此外，还展示了如何在主类MyMain中获取Singleton实例并打印其静态成员变量counter1和counter2的值。

class Singleton {

private static Singleton obj = new Singleton();

public static int counter1;

public static int counter2 = 0;

private Singleton() {
  counter1++;
  counter2++;
  System.out.println("constructor counter2's value :"+counter2);
}

public static Singleton getInstance() {
System.out.println("getInstance counter2's value :"+counter2);
return obj;
}
}

public class MyMain {

@SuppressWarnings("static-access")

public static void main(String[] args) {

  Singleton obj = Singleton.getInstance();
  System.out.println("obj.counter1=" + obj.counter1);
  System.out.println("obj.counter2=" + obj.counter2);

  Singleton obj1 = Singleton.getInstance();
  System.out.println("obj1.counter1=" + obj1.counter1);
  System.out.println("obj1.counter2=" + obj1.counter2);
}
}

输出结果是：

obj.counter1=1
obj.counter2=0
obj1.counter1=1
obj1.counter2=0

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