Close JFrame in Netbeans

Hello,
I have a java application in NetBeans. I have been using Netbean absolut layout. I didn´t create JFrame class variable at all, instead using:Ok is a button
ok.setFont(new java.awt.Font("Arial", 0, 10));
ok.setToolTipText("ok");
ok.setLabel("ok");
ok.setMargin(new java.awt.Insets(2, 2, 2, 2));
getContentPane().add(ok, new org.netbeans.lib.awtextra.AbsoluteConstraints(160, 150, 60, 20));
ok.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
okPerformed(evt);
I don´t want to use System.exit(0); because it will shut down whole system. In order to use dispose method, I created a JFrame class variable in beginning of the class, but it doesn´t work.
JFrame frame = new JFrame();
public void okPerformed (java.awt.event.ActionEvent evt){
this.frame.dispose();
Can anyone help me?
Thanks

hello,
Thanks for replying my message so fast.
I tried, but it still doesn´t work. I am using netbeans absolute Layout. It doesn´t really have frame. Here is my code
public class tt extends JFrame{
JFrame frame = new JFrame();
JTextField text1= new JTextField(20);
JButton ok = new JButton();
public tt throws Exception
setSize(400,300);
setTitle("tt");
getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
text1.setFont(new java.awt.Font("Arial",0,12));
text1.setBounds(5, 8, 5, 5);
text1.setEditable(true);
getContentPane().add(text1, new org.netbeans.lib.awtextra.AbsoluteConstraints(230, 30, 100, 20));
ok.setFont(new java.awt.Font("Arial", 0, 10));
ok.setToolTipText("ok");
ok.setLabel("ok");
ok.setMargin(new java.awt.Insets(2, 2, 2, 2));
getContentPane().add(ok, new org.netbeans.lib.awtextra.AbsoluteConstraints(160, 150, 60, 20));
ok.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
okPerformed(evt);
setVisible(true);
public void okPerformed (java.awt.event.ActionEvent evt){
setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
Thanks

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{color:#0000ff}http://homepage1.nifty.com/algafield/sscce.html{color}
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