Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

public class Main extends JFrame implements ActionListener {
    JTextArea f = new JTextArea("A medium sized text");

    public Main() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel all = new JPanel();
        JButton button = new JButton("Expand");
        button.addActionListener(this);

        all.add(button);
        all.add(f);
        getContentPane().add(all);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                f.setText(f.getText() + "\n" + f.getText());
                setSize(getPreferredSize());
            }
        });
    }

    public static void main(String[] args) {
        Main lst = new Main();
        lst.setVisible(true);
        lst.pack();
    }
}