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单例模式实例解析

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 · 367 阅读

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#constructor #class #string

本文通过一个具体的Java示例详细解析了单例模式的实现方式。示例中定义了一个单例类Singleton，并在主类MyMain中进行了实例化操作，展示了如何通过静态方法getInstance()获取Singleton的唯一实例。

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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