class Check{ public boolean validate(String name,String password){ if(name.equals("wupeng")&&password.equals("aaaa")) return true; else{ return false; } } } class Operate{ private String info[]; public Operate(String info[]){ this.info=info; } public String login(){ Check check=new Check(); this.isExit(); String name=this.info[0]; String password=this.info[1]; String str=null; if(check.validate(name,password)){ str="欢迎"+name+"光临!"; } else{ str="错误的用户名和密码!"; } return str; } public void isExit(){ if(this.info.length!=2){ System.out.println("输入参数不正确,程序退出~"); System.out.println("格式:java LoginDemo1 用户名 密码"); System.exit(1); } } } public class LoginDemo2 { public static void main(String args[]){ Operate oper=new Operate(args); System.out.println(oper.login()); } }