面向对象的一个小例子---登陆验证

package lianxijihe;
class Check{
public boolean validate(String name,String password){
if(name.equals("yangzhi")&&password.equals("123")){
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 str =null;
if(check.validate(info[0], info[1])){
str ="欢迎"+info[0]+"登陆";
}else{
str = "错误的用户名和密码";
}
return str;

}
public void isExit(){
if(this.info.length!=2){
System.out.println("输出参数不正确，系统退出！");
System.exit(1);
}
}
}
public class lianxi012 {
public static void main(String args[]){
Operate oper = new Operate(args);
System.out.println(oper.login());
}
}