PLEASE HELP - JUST SOME GUIDANCE I AM STUCK!!!!!!!!

Question

Hi, I was wondering if anyone can help me, I am very new to Java, and I am trying to create piece of program that acts like a bank account. So far I have this bit working but I need to add some sort of interaction menu, i.e. if you look below it displays the information from two accounts, one Gao and one Johns. I want it so that before it displays this to ask the user for the account number and then display the correct account. I hope this makes sense. I have tried all day to add some sort of interaction menu here, but no luck. All I am asking is for some advice on how I could possibly achieve this, and where would I put the menu code. I am really really stuck and this is giving me a headache! Please help!
// The code starts here
class BankAccount
     String name;
     String AcNo;
     double deposit;
     BankAccount() {}
     BankAccount(String aName, String aAcNo, double aDep)
          name = aName;
          AcNo = aAcNo;
          deposit = aDep;
     public void setName(String aName)
          name=aName;
     public void setAcNo(String aAcNo)
          AcNo = aAcNo;
     public void setDeposit(double aDep)
          deposit = aDep;
     public String getName()
          return name;
     public String getAcNo()
          return AcNo;
     public double getDeposit()
          return deposit;
     public double withDrawCash(double cash)
          if (cash <=deposit)
               deposit = deposit-cash;
               return(cash);
          else
          System.out.println("Not enough money in your account!");
          return (0);
class demo
     public static void main(String args[])
          BankAccount myBankAc = new BankAccount("Gao", "12-23-34", 1000);
          BankAccount JohnBankAc = new BankAccount("John", "34-56-90", 200000);
          myBankAc.withDrawCash(500);
          System.out.println("MY balance is : " + myBankAc.getDeposit());
          System.out.println("MY name is : " + myBankAc.getName());
          System.out.println("MY AcNo is : " + myBankAc.getAcNo());
          JohnBankAc.withDrawCash(2000);
          double balance = JohnBankAc.getDeposit();
          System.out.println("John's balance is : " + balance);
}

Answer 1

a few suggestions:
(1) Either put the menu code in the main() method of your bank account or put it in a separate class and instantiate an instance of that class in main().
(2) If you want to input an owner name or account number and then have the main method print the correct account you'll want to write a toString() method for your BankAccount class that will let you print out the name, account number, and current balance. Then you'll want to add a bunch of BankAccounts to a data structure like a java.util.Map where the key is the owner name or account number (whichever one you want to do the search on) and the value is the BankAccount object.
(3) Better to externalize the data you want to do the search on into a text file rather than hard-coding all the BankAccount info in your main class.
If you could figure out how to write a new BankAccount to this file it'd be pretty neat, because then you'd have all the ingredients for a simple, flat file-based database: it would read existing accounts, let you search for an individual account, update balances by making deposits/withdrawals, and insert new accounts.
If I were your professor, and you managed this feat, I'd give you an A.
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