单例模式

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package test;public class Test {public static void main(String[] args) {for (int i = 0; i < 5; i++) {Singal singal=Singal.getInstance();System.out.println("-------------");}}}
package test;public class Singal {public Singal() {System.out.println("Test");}public static Singal getInstance(){System.out.println("getInstance");return innerClass.test;//return null;}static class innerClass{static{System.out.println("innerClass static");}public  static Singal test=new Singal();}}


getInstanceinnerClass staticTest-------------getInstance-------------getInstance-------------getInstance-------------getInstance-------------


分析静态内部类 不是类加载的时候就被调用,而是在调用的时候才加载静态类属性,