Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class Main extends JFrame implements WindowFocusListener {
    static Main frame = new Main("WindowEventDemo");
    JTextArea display;

    public static void main(String[] args) {
        frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        frame.addComponentsToPane();
        frame.pack();
        frame.setVisible(true);
    }

    private void addComponentsToPane() {
        display = new JTextArea();
        display.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(display);
        scrollPane.setPreferredSize(new Dimension(500, 450));
        getContentPane().add(scrollPane, BorderLayout.CENTER);
        addWindowFocusListener(this);
    }

    public Main(String name) {
        super(name);
    }

    public void windowGainedFocus(WindowEvent e) {
        displayMessage("WindowFocusListener method called: windowGainedFocus.");
    }

    public void windowLostFocus(WindowEvent e) {
        displayMessage("WindowFocusListener method called: windowLostFocus.");
    }

    private void displayMessage(String msg) {
        display.append(msg + "\n");
        System.out.println(msg);
    }
}