I think I'm starting to get it, but have some questions - public classes

I was making a test program, where I thought I coukld easily improve it as I go.

It is a banking program, the first thign was this.

1 class file
Basically just had withdrawn, total, and deposited variables, no way of customizing them without changing source code.

Second version was this
2 class files
methods.class
deposit.class

Open up deposit.class and it used methods I stated in methods.class, such as

Code:

public double withdraw( double amount )
	{
                // See if amount can be withdrawn
		if (balance >= amount)
		{
			
			balance -= amount;
			totalWithdrawn += amount;
			System.out.println("Withdrawal request accepted. Withdrawing..." );
                        return amount;
		}
		else
                // Withdrawal not allowed
				System.out.println("Not enough to withdraw, withdrawal request denied.");
                        return 0.0;

And calling it like this in deposit.class

Code:

my_account.deposit(250.00);

And it knew the deposit(); from methods.class, without me importing or stating or anything.

But now, I'm stuck at user input.

Here is account.class (used to be method.class)

Code:

import javax.swing.JOptionPane;

public class Account 
{
        protected double balance;
		int totalWithdrawn;
		static String amount;

        // Constructor to initialize balance
        public Account( double amount )
	{
		balance = amount;
	}

        // Overloaded constructor for empty balance
        public Account()
	{
		balance = 0.0;
	}

        public void deposit( double amount )
	{
		balance += amount;
	}

        public double withdraw( double amount )
	{
                // See if amount can be withdrawn
		if (balance >= amount)
		{
			
			balance -= amount;
			totalWithdrawn += amount;
			System.out.println("Withdrawal request accepted. Withdrawing..." );
                        return amount;
		}
		else
                // Withdrawal not allowed
				System.out.println("Not enough to withdraw, withdrawal request denied.");
                        return 0.0;
						
	}
//
        public double getbalance()
	{
                return balance;
	}
//	
	public double getWithdrawn()
	{
		return totalWithdrawn;
	}
//
	 public double withdrawInput()
	 { 

          String userInput = JOptionPane.showInputDialog("Enter a value to withdraw: ");
          System.out.println(userInput);
          amount = (userInput);
          System.out.println("Withdrawing " +amount );
          return balance;
          
     }

}  

Here is withdrawInput, made to sue user input to state the withdraw amount.

Code:

import javax.swing.JOptionPane;


public class withdrawInput 
{

		        public static void main(String args[])
	{
                // Create an empty account
                Account my_account = new Account();
				

                // Deposit money
		my_account.deposit(250.00);

                // Print current balance
		System.out.println ("Current balance: " +
			my_account.getbalance());

                // Withdraw money
		my_account.withdraw(80.00);

                // Print remaining balance
		System.out.println ("Remaining balance: " + my_account.getbalance());
		withdrawInput();
			
			// Print total amount withdrawn
			System.out.println ("Total amount ever withdrawn: " + my_account.getWithdrawn());
			

                
	}

				private static void withdrawInput() {
			          String userInput = JOptionPane.showInputDialog("Enter a value to withdraw: ");
			          System.out.println(userInput);
			          Object amount = (userInput);
			          System.out.println("Withdrawing " +amount );
			          return;
					
				}


     
}

first off, I know that private static void withdrawInput is in wrong spot, but every time I move it I get like 4 errors, and I spent forever trying to fix them, nothing worked.


Questions: how do I fix the last 2 code s so that it will use the input dialogue to set the variable THAT IS NOT A STRING.

I tried about 50 different ways, I keep getting told it's a string, then getting told it's not 3 errors later, etc.

I'm really stuck

 

Your withdrawInput() method in the account class should look something like this.

Code:

	 public double withdrawInput()
	 { 
          double userInput = 0;
          try {
              double userInput = Double.parseDouble(JOptionPane.showInputDialog("Enter a value to withdraw: "));
              withdraw(userInput);
          }
          catch(Exception e) {
          }
         return userInput;
     }

Now I don't know why you're defining the withdrawInput() method again in the WithdrawInput class since you just want to use the one from the Account class anyway. In your main method you should just be calling my_account.withdrawInput().