摘要： 1、 public class ExceptionDemo1 { public static void main(String[] args) { System.out.println("1、除法计算开始："); try { int x = 10; int y = 0; System.out.pri 阅读全文

摘要： 1、单例设计 class Singleton{ private static final Singleton SINGLETON =new Singleton(); public static Singleton getSingleton(){ return SINGLETON; } private 阅读全文