Setting a button to run a constructor?

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January 3rd, 2013, 07:17 PM

notelek

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Join Date: Jan 2013

Posts: 2

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Setting a button to run a constructor?

Hi!
I am new here, and have a simple question
say I had a simple jframe and button:

Code:

public static void main(String[] args){
JFrame frame = new JFrame();
frame.setSize(new Dimension(800, 600));
frame.setVisible(true);
frame.setLocationRelativeTo(null);

JButton button = new JButton();
button.setSize(new Dimension(100 ,100));
button.setLocation(5,5);
button.setVisible(true);
frame.getContentPane().add(button);
}

How would I make button run a certain constructor?
also, can it run one that is in a different class?

January 10th, 2013, 01:39 PM

jayhamm

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Join Date: Jan 2013

Posts: 1

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Code:

public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(new Dimension(800, 600));
frame.setVisible(true);
frame.setLocationRelativeTo(null);

JButton button = new JButton();
button.setSize(new Dimension(100 ,100));
button.setLocation(5,5);
button.setVisible(true);
        
//add an ActionListener to your button
button.addActionListener(new ActionListener() {

@Override //required to override abstract actionPerformed() method from ActionListener interface
public void actionPerformed(ActionEvent e) {
System.out.println("Button pressed!");
//Add your constructor here
//Constructor constructor = new Constructor();
}
});

frame.getContentPane().add(button);
}

This should work for the specific case you asked for. It adds a unique action listener to button and you can replicate this multiple times for multiple buttons. If you want to have a single actionPerformed() method for multiple buttons you need to move this out of the main method. I'm not a Java guru but it has something to do with the main method being static.

You also should make sure that your class implements the ActionListener and that you import the right packages:

Code:

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;

public class Test implements ActionListener

Last edited by jayhamm : January 10th, 2013 at 04:16 PM. Reason: add import/implement statements

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