unreported exception InvalidWithdrawalException; must be caught or declared to be thrown w.withDraw

[moaid najem]

I have done the code but the error unreported exception InvalidWithdrawalException; must be caught or declared to be thrown
w.withDrawal(200.00, 100.00); shown

my code is

import java.util.*;



class InvalidWithdrawalException extends Exception


{


public InvalidWithdrawalException()

{


}

public InvalidWithdrawalException(String message)

{

super(message);

}

public InvalidWithdrawalException(Throwable cause)

{

super(cause);

}

}


class AccountServer

{

double balance, withdrawal, deposit;


public static void withDrawal(double withdrawal, double balance) throws InvalidWithdrawalException

{

if(withdrawal > balance){


throw new InvalidWithdrawalException();}

}





public static void transaction(double deposit, double withdrawal, double balance) throws IllegalArgumentException


{

if (deposit <0 || withdrawal < 0)

throw new IllegalArgumentException ();

}
}

class CustomerClient

{

String customerName;

long accountNo;
double newb, balance, withdrawal, deposit;


public void customerWithdrawal()

{



try
{
AccountServer n = new AccountServer();
n.withDrawal(withdrawal, balance);

}

catch (InvalidWithdrawalException e)

{

System.out.println("your balance is low");

}

}


public void customerDeposit()

{


try

{

newb = deposit + balance;
System.out.println("new balance: " + newb);

}

catch (IllegalArgumentException e)

{

e.printStackTrace();

}

}

}

public class AccountManager
{

public static void main(String[] args)
{
//Scanner scan = new Scanner( System.in );
AccountServer w = new AccountServer();
AccountServer d = new AccountServer();

w.withDrawal(200.00, 100.00);
d.transaction(-200.00, -100.00, 300.00);
//transaction(deposit);
}

}

any help?

[Knute Snortum]

Welcome to the Ranch!

That error means that the exception that withDrawal() throws must either be caught with a try/catch block or declared to be thrown by main().

Now a few words about displaying code. Always UseCodeTags (that's a link). It makes the code more readable. You should also get rid of most of the blank lines. Leave only a blank line that helps group together important lines, like between methods. And last but not least, make sure your indentation is correct. This isn't just because it looks nice; it shows correct structure.

[Knute Snortum]

Here's how your code should look:

import java.util.*;

class InvalidWithdrawalException extends Exception
{
	public InvalidWithdrawalException()
	{
	}

	public InvalidWithdrawalException(String message)
	{
		super(message);
	}

	public InvalidWithdrawalException(Throwable cause)
	{
		super(cause);
	}
}

class AccountServer
{
	double balance, withdrawal, deposit;

	public static void withDrawal(double withdrawal, double balance)
			throws InvalidWithdrawalException
	{
		if (withdrawal > balance) {
			throw new InvalidWithdrawalException();
		}
	}

	public static void transaction(double deposit, double withdrawal,
			double balance) throws IllegalArgumentException
	{
		if (deposit < 0 || withdrawal < 0)
			throw new IllegalArgumentException();
	}
}

class CustomerClient
{
	String customerName;
	long accountNo;
	double newb, balance, withdrawal, deposit;

	public void customerWithdrawal()
	{
		try {
			AccountServer n = new AccountServer();
			n.withDrawal(withdrawal, balance);
		}
		catch (InvalidWithdrawalException e)
		{
			System.out.println("your balance is low");
		}
	}

	public void customerDeposit()
	{
		try
		{
			newb = deposit + balance;
			System.out.println("new balance: " + newb);
		}
		catch (IllegalArgumentException e)
		{
			e.printStackTrace();
		}
	}
}

public class AccountManager {

	public static void main(String[] args) {
		// Scanner scan = new Scanner( System.in );
		AccountServer w = new AccountServer();
		AccountServer d = new AccountServer();
		w.withDrawal(200.00, 100.00);
		d.transaction(-200.00, -100.00, 300.00);
		// transaction(deposit);
	}
}

[Knute Snortum]

There are some other problems with your code. The methods withDrawal() and transaction() shouldn't be static, since you're accessing them with objects. Making a method static means it belongs to the class, not an instance of the class (object).