java课程设计例子

摘要： package com.han; public class HanTest { public static void main(String[] args){ if(args==null){ throw new NullPointerException("The input is \"null\""); }else if((args.length!=1&&args.length!=2)){ Throwable cause=new Throwable("You have to input 1 or 2 String argumen 阅读全文