Java编写的模拟ATM取款机程序

 /**********取款**********/
 public void BetBalance() throws Exception
 {
  String str=null,str1;
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  do {
   System.out.println("请输入您要取的数目:");
   str=br.readLine();
   str1=String.valueOf(act.get_Money());
   if(str.compareTo(str1)>0) {
    System.out.println("超过已有的钱数,请重新输入您要取的数目:");
   }
   else {
    /*操作成功*/
//    act.set_Balance(str);
    System.out.println("取款成功,请收好您的钱.");
    Welcome();
    SysOpter();
   }
  }while(true);
  
 }
 
 /**********判断卡内是否有钱**********/
 protected boolean isBalance() {
  if(act.get_Money()<0) { 
//   System.out.println("对不起,您的钱数不够或卡已透支.");
   return false;
  }
  return true;
 }
 
 /********卡号密码是否正确******/
 protected boolean isRight(String card,String pwd)
 {
  if(act.get_Code().equals(card) && act.get_Password().equals(pwd))
   return true;
  else
   return false;
 }
 
 /**********密码修改**********/
 protected void Set_Password() throws Exception
 {
  String pwd=null;
  int counter=0;
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  do {
   System.out.println("请输入旧密码:");
   pwd=br.readLine();
   if(act.get_Password().equals(pwd))
   {