How to avoid NullPointerException---String array created from JTextArea

Question

Hi,
I use the method getText() to put the contents of a JTextArea into a String object. Then I use split("\\s+") on that String object to get a String array. Before the contents of the String array are output, I get a NullPointerException. How do I avoid this exception? My code is below.
//: net/mindview/util/SwingConsole.java
package net.mindview.util;
import javax.swing.*;
public class SwingConsole {
  public static void
  run(final JFrame f, final int width, final int height) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        f.setTitle(f.getClass().getSimpleName());
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(width, height);
        f.setVisible(true);
} ///:~
//: gui/Charts.java
package gui;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import net.mindview.util.SwingConsole;
public class Charts extends JFrame {
    private int[] numbers;
    private JTextArea input = new JTextArea();
    private JScrollPane areaScrollPane = new JScrollPane(input);
    private JButton b1 = new JButton("Submit");
    private JButton b2 = new JButton("Clear");
    public Charts() {
        add(areaScrollPane);
        areaScrollPane.setPreferredSize(new Dimension(250, 250));
        b1.addActionListener(a1);
        b2.addActionListener(a2);
        add(b1);
        add(b2);
    private ActionListener a1 = new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            String data = input.getText();
            String[] stringArray = data.split("\\s+");
            for (String s:stringArray)
                System.out.print(s + " ");
            int i = 0;
            for (String s:stringArray)
                numbers=Integer.parseInt(s);
i++;
private ActionListener a2 = new ActionListener() {
public void actionPerformed(ActionEvent e) {
input.setText("");
* @param args the command line arguments
public static void main(String[] args) {
// TODO code application logic here
SwingConsole.run(new Charts(), 400, 400);
Edited by: gluedtothecomputer on Feb 1, 2009 7:59 PM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

don't forget to init your int array:
      String[] stringArray = data.split("\\s+");
      numbers = new int[stringArray.length];