Java making confirming exit

I have an application. I need to make this, when user click the close button, a confirmation will come ( just like javascript confirm dialog ) , 'Are you sure'? I'm using Swing visual editor in Netbeans and I'm using a listener on window closing. But I can't make it. Any help?


Try this code:

jj4.addActionListener(new ActionListener() // jj4-button's reference to implement exit { public void actionPerformed(ActionEvent ae) { if(!jtextarea.getText().equals("") && !jtextarea.getText().equals(fileContent)) { if(fileName == null) { //this method have 3 options (1 = YES, 2 = NO, 3 = Cancel) option = JOptionPane.showConfirmDialog(null,"Do you want to save the changes ??"); if(option == 0) { //to save the text into file saveAs(); System.exit(0); } if(option == 1) { //to exit the program without saving System.exit(0); } } else { option = JOptionPane.showConfirmDialog(null,"Do you want to save the changes ??"); if(option == 0) { save(); System.exit(0); } if(option == 1) { System.exit(0); } } } else { System.exit(0); } } });


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