I am programming a code editor in java and ran into a problem while trying to add an ActionListener to a button implemented in the parent class. The ActionListener implementation should be within the child class.
I have written the parent class DialogCreator and the child class ClassCreator this way.
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
class DialogCreator extends JFrame implements ActionListener {
protected JButton buttonCancel;
protected JDialog jDialog;
public DialogCreator() {
jDialog = new JDialog(this ,"title", true);
jDialog.setLayout(null);
jDialog.setSize(400,400);
buttonCancel = new JButton("Cancel");
buttonCancel.setBounds(20,20,100,30);
jDialog.add(buttonCancel);
jDialog.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
}
}
class ClassCreator extends DialogCreator{
public ClassCreator(){
super();
buttonCancel.addActionListener((e)->jDialog.dispose());
}
}
public class Main {
public static void main(String[] args) {
new ClassCreator();
}
}
Program compiled successfully and I expected to close the jDialog when I click on Cancel button. But nothing happened. So can you tell me where I did wrong. The ClassCreator is parent to multiple child class in my code.
The mistake your making in your code is using super(). Remember that a JDialog waits until it gets a response before continuing. So your listener is added after you close the JDialog. So try using this instead:-
...
public ClassCreator(){
super();
buttonCancel.addActionListener((e)-> jDialog.dispose());
jDialog.setVisible(true);
}
...
Make sure you remove jDialog.setVisible from DialogCreator constructor.