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import java.io.*;
 
class account
{
  String account = "-1";
  int money = 0;
  
  account(String ID, int money)
  {
    this.account = ID;
    this.money = money;
  }
 
  void takeMoney(int m)
  {
    System.out.println(this.account+"f");
  }
  void saveMoney(int m)
  {
    this.money += m;  
  }
  void showMoney()
  {
    System.out.println(this.account + " 存款餘額為 : " + this.money);
    return this.money;
  }
}
 
class Bank
{
  public static void main(String args[])throws IOException
  {
    
    int action = 0;
    int index = 0;
    account user[] = new account[255];
    while(action != -1)
    {
      System.out.println("輸入使用的功能\n1.建立帳戶\n2.存款\n3.提款\n4.查詢餘額");
      System.out.println("輸入-1離開");
      BufferedReader Bf = new BufferedReader(new InputStreamReader(System.in));
      String buffer = Bf.readLine();
      action = Integer.parseInt(buffer);
      
      if(action == 1) // create a new account
      {
        System.out.println("輸入新增帳戶名:");
        BufferedReader Buf = new BufferedReader(new InputStreamReader(System.in));
        String ID = Buf.readLine();
        user[index] = new account(ID, 0);
        index++;
      }
      else if(action == 2)
      {
        int money;
        int m;
        int usable = 0;
        int select;
        System.out.println("可操作的帳號編號:");
        for(usable = 0; usable < index; usable++)
        {
          System.out.println("編號 : " + usable + " 帳號名稱 : " + user[usable].account);
        }
        System.out.println("Select user :");
        BufferedReader Bs = new BufferedReader(new InputStreamReader(System.in));
        String s = Bs.readLine();
        select = Integer.parseInt(s);
        if(select > usable){
          //
        }
        else{
          System.out.println("預存入多少金額:");
          BufferedReader Br = new BufferedReader(new InputStreamReader(System.in));
          String f = Br.readLine();
          m = Integer.parseInt(f);
          user[select].saveMoney(m);  
        }        
          
      }
      else if(action == 3)
      {
        /*int money;
        int m;
        System.out.println("需提出多少金額:");
        BufferedReader Bm = new BufferedReader(new InputStreamReader(System.in));
        String g = Bm.readLine();
        int m = money;
        money -= Integer.parseInt(g);
        System.out.println("餘額為:" + m +); */
      }
          
      else if(action == 4)
      {
        int number = 0;
        int inputBuf;
        String IDNO;
        System.out.println("可使用的帳號編號:");
        for(number = 0; number < index; number++)
        {
          System.out.println("編號 : " + number + " 帳號名稱 : " + user[number].account + "餘額 : " + user[number].showMoney());
        }
        number = 0;
        System.out.println("輸入欲查詢的帳號編號 : ");
        BufferedReader Buff = new BufferedReader(new InputStreamReader(System.in));
        String num = Buff.readLine();
        inputBuf = Integer.parseInt(num);  
        if(inputBuf > number)
        {
          System.out.println("輸入編號錯誤");  
        }
        else
          user[number].showMoney();
      }
      else if(action == -1);
      else
      {
        System.out.println("輸入錯誤");
      }
    }
 
    
  }
}