ActionListener And Action Class Level Variable Swing Event

Java Code:


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

public class Main extends JFrame {

	JTextField field = new JTextField();

	public static void main(String[] args) {
		Main listner = new Main();
	}

	public Main() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		JButton button = new JButton("Press me");
		button.addActionListener(new ButtonListener());
		this.getContentPane().setLayout(new BorderLayout());
		this.getContentPane().add(button, BorderLayout.SOUTH);
		this.getContentPane().add(field, BorderLayout.NORTH);
		this.pack();
		this.setVisible(true);
	}

	class ButtonListener implements ActionListener {
		boolean toggle = true;

		public void actionPerformed(ActionEvent e) {
			if (toggle)
				field.setText("Java Code");
			else
				field.setText("Hello");
			toggle = !toggle;
		}
	}
}

import java.awt.BorderLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class Main extends JFrame {

JTextField field = new JTextField();

public static void main(String[] args) {

Main listner = new Main();

}

public Main() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JButton button = new JButton("Press me");

button.addActionListener(new ButtonListener());

this.getContentPane().setLayout(new BorderLayout());

this.getContentPane().add(button, BorderLayout.SOUTH);

this.getContentPane().add(field, BorderLayout.NORTH);

this.pack();

this.setVisible(true);

}

class ButtonListener implements ActionListener {

boolean toggle = true;

public void actionPerformed(ActionEvent e) {

if (toggle)

field.setText("Java Code");

else

field.setText("Hello");

toggle = !toggle;

}

Output:

You may also like

Leave a Comment X