class Check {    public boolean validate(String name,String password){        if (name.equals("xiongchenghao")&&password.equals("asdf")){            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("输入的参数不正确，系统退出！");            System.out.println("格式:java LoginDemo02 用户名 密码");            System.exit(1);        }    }}public class LoginDemo02{    public static void main(String args[]){        Operate oper=new Operate(args);        System.out.println(oper.login());    }}