cygwin/gcc与MinGW

最新推荐文章于 2024-12-10 17:50:00 发布

chenzhiya

最新推荐文章于 2024-12-10 17:50:00 发布

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CC 4.0 BY-SA版权

文章标签： constructor class string

本文链接：https://blog.youkuaiyun.com/chenzhiya/article/details/2012935

本文通过一个具体的Java代码示例详细介绍了单例模式的实现方式。该示例中定义了一个单例类Singleton，并通过静态成员变量实现了单例的实例化。主函数中展示了如何获取Singleton的唯一实例并访问其成员变量。

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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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