The following code takes a binary string from user input and converts it into a decimal number. The input is recieved through the first textfield labeled binary string and when the "convert to decimal" button is presed, displays the output in the second textfield labeled decimal string. The method parseBinary is supposed to throw a NumberFormatException when any character other than a 0 or 1 is entered. However, I am having trouble getting the invalid character to display in the second textbox. Any suggestions how to fix this?

import java.awt.BorderLayout;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import javax.swing.AbstractButton;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Test

{

static JTextField txt1 = new JTextField(30);

static JTextField txt2 = new JTextField(30);

static char invalidChar = ' ';

/**

* Converts a binary string into a decimal integer and

* back into a String then displays output in text field

*

* @param binaryString a string to hold binary string

* input from user

*/

private static void parseBinary(String binaryString) throws NumberFormatException

{

for(int i = 0; i

if(binaryString.charAt(i) != '0' && binaryString.charAt(i) != '1') {

invalidChar = binaryString.charAt(i);

throw new NumberFormatException();

}

else {

int decimalValue = Integer.parseInt(binaryString, 2);

String decimalString = Integer.toString(decimalValue);

txt2.setText(decimalString);

}

}

}

/**

* GUI interface for user input for method

* parseBinary

*

*/

public static void main(String[] args)

{

JFrame frame = new JFrame("Convert Binary to Decimal");

JPanel panel = new JPanel();

panel.setLayout(null);

JButton b1 = new JButton("Convert to Decimal");

b1.setBounds(0, 125, 593, 30);

txt1.setBounds(120, 20, 470, 30);

txt2.setBounds(120, 60, 470, 30);

JLabel lbl1 = new JLabel("Binary String");

lbl1.setBounds(10, 20, 300, 30);

JLabel lbl2 = new JLabel("Decimal String");

lbl2.setBounds(10, 60, 300, 30);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

frame.setResizable(false);

frame.setSize(600, 200);

panel.add(b1);

panel.add(txt1);

panel.add(txt2);

panel.add(lbl1);

panel.add(lbl2);

frame.add(panel);

b1.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

try {

parseBinary(txt1.getText());

} catch (NumberFormatException ex) {

txt2.setText("Invalid format for binary string. Invalid character: " + invalidChar);

}

}

});

}

}

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