Thread: Swing Help

package gui;
 
import java.awt.*;
import java.awt.event.*;
 
import javax.swing.*;
 
public class javaFP extends JApplet implements ActionListener{
	JButton b;
	JButton b1;
	JButton b2;
	JTextField field;
	public String text;
	public void init(){
		try{
		SwingUtilities.invokeAndWait(new Runnable(){
			public void run(){
				swingGUI();
			}
		});
	}
		catch(Exception e){
			System.out.println(e);
		}
	}
	public void swingGUI(){
 
		/*b= new JButton("Button 1"); 
		b.addActionListener(
				new ActionListener() {
					public void actionPerformed(ActionEvent e) {
						field.setText("Button 1");
					}
				}
				);
		b1= new JButton("Button 2"); 
		b1.addActionListener(
				new ActionListener() {
					public void actionPerformed(ActionEvent e) {
						field.setText("Button 2");
					}
				}
				);*/
		JButton b = new JButton(new AbstractAction ("Button 1") {
			 public void actionPerformed( ActionEvent e ) {
				 field.setText("Button 1");
			 }
		});
 
		JButton b1 = new JButton(new AbstractAction ("Button 2") {
			 public void actionPerformed( ActionEvent e ) {
				 field.setText("Button 2");
			 }
		});
 
		JButton b2 = new JButton(new AbstractAction ("Button 3") {
			 public void actionPerformed( ActionEvent e ) {
				 field.setText("Button 3");
			 }
		});
 
		JTextField field = new JTextField(20);
		setLayout(new FlowLayout());
		setSize(300, 250);
		setVisible(true);
		add(b);
		add(b1);
		add(b2);
		add(field);
		field.setEditable(true);
		b.addActionListener(this);
		b1.addActionListener(this);
		b2.addActionListener(this);
 
	}
	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
 
	}
}

Using this code I keep getting an error. The way this is supposed to work is that when I click on any button, 1 2 or 3, it puts the name of the button into the TextField. When I click on a button all I get is this:

Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
at gui.javaFP$2.actionPerformed(javaFP.java:46)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.jav a:6505)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3321)
at java.awt.Component.processEvent(Component.java:627 0)
at java.awt.Container.processEvent(Container.java:222 9)
at java.awt.Component.dispatchEventImpl(Component.jav a:4861)
at java.awt.Container.dispatchEventImpl(Container.jav a:2287)
at java.awt.Component.dispatchEvent(Component.java:46 87)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:4422)
at java.awt.Container.dispatchEventImpl(Container.jav a:2273)
at java.awt.Component.dispatchEvent(Component.java:46 87)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.j ava:703)
at java.awt.EventQueue.access$000(EventQueue.java:102 )
at java.awt.EventQueue$3.run(EventQueue.java:662)
at java.awt.EventQueue$3.run(EventQueue.java:660)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:676)
at java.awt.EventQueue$4.run(EventQueue.java:674)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 673)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:244)
at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:147)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:139)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:97)

You have defined several variables with the same name local to methods that ALL shadow the variable that you want to assign the value to. Remove the definitions from all the methods and move the definition to the class level.

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