Hello, I am new to java. I am having an issue with a java program that I am making. It has a try-catch loop to make sure the user inputted a number, but I cant use the string outside of the loop.t from testa.java, and is supposed to send it to testb.java... I am getting the error:

testa.java:59: cannot resolve symbol
symbol  : variable convAmountEuros 
location: class testa
		testb.convert(convAmountEuros, convExchangeRate);

The program uses 2 class files. It takes the input from testa.java, and sends 2 strings (amountEuros and exchangeRate) and sends those to testb.java to do all of the math there.. Any help is greatly appreciated!

The program is to convert euros - us dollars.

Code from testa.java

import javax.swing.*;

public class testa {

	public static void main (String[] args){

		String amountEuros = " ";
		String exchangeRate;
		double convExchangeRate = 0;
		//double convAmountEuros;
		int step = 1;

    JFrame frame = new JFrame();

    Icon menuIcon = new ImageIcon("logo.png");

    //Display Welcome
    JOptionPane.showMessageDialog(frame, "Welcome To Euro Convert\nPlease Click OK To Procede:", "Select an Option", JOptionPane.QUESTION_MESSAGE, menuIcon);


		ImageIcon icona = new ImageIcon("1.jpg");
		ImageIcon iconb = new ImageIcon("2.jpg");

while (step == 1){
			//Input Total Number of Euros
			amountEuros = JOptionPane.showInputDialog(null,"Please Input The Number Of Euros:");
try {
			//Put Number of euros in constant
			final double convAmountEuros = Double.parseDouble (amountEuros);
step++;
} catch (NumberFormatException nfe){
JOptionPane.showMessageDialog(frame, "INPUT ERROR: Please Input An Integer!");
}
}

while (step == 2){
			//Input exchange rate
			exchangeRate = JOptionPane.showInputDialog(null,"Please Input The Exchange Rate:");

try {
			//convert to integer
			convExchangeRate = Double.parseDouble (exchangeRate);
//testb.convert(convAmountEuros, convExchangeRate);
step++;
} catch (NumberFormatException nfe){
JOptionPane.showMessageDialog(frame, "INPUT ERROR: Please Input An Integer!");
}
}






			//convert to integer
			//convExchangeRate = Double.parseDouble (exchangeRate);
while (step == 3){

//		testb.convert(convAmountEuros, convExchangeRate);
}

		System.exit(1);

	//end of main method
	}

//end of class
}

Code from testb.java

import java.text.*;
import javax.swing.*;

public class testb {

public static double convert(double amountEuros, double exchangeRate)
{
//Set Decimal Formats
DecimalFormat tenths = new DecimalFormat ("#,###.##");
DecimalFormat round = new DecimalFormat ("#,###.##");

//Define Strings
double newamount = 0;
double roundedamount = 0;

newamount = (amountEuros*exchangeRate);
//System.out.println(newamount);

JFrame frame = new JFrame();
ImageIcon icon = new ImageIcon("flag.png");

//roundedamount = newamount;
//roundedamount = Math.round(roundedamount);

//Display message with all of the data
JOptionPane.showMessageDialog(frame, "The Amount of Euros Is: " + round.format(amountEuros) + "\nThe Exchange Rate Is: " + round.format(exchangeRate*.988) + "%\nExchangable US Dollars: " + round.format(newamount*.988) + "\nPayable US Dollars: "+round.format(newamount*.988),    "Inane warning",JOptionPane.WARNING_MESSAGE,icon);

//throw back the strings
return(newamount);

//end of main method
}

//end of class
}

Thanks!
-Flightfanatic