摘要： 1 public class Singleton { 2 private Singleton(){//private避免构造函数在类外被随意调用 3 System.out.println("create a instance"); 4 } 5 public static Singleton getInstance(){//定义成static可以在类外通过类名.getInstance()获得 6 System.out.println("getInstance"); 7 return InnerClass.testInsta... 阅读全文