Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Color;
import java.awt.Graphics;

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

public class Main {
    public static void main(String[] args) {
        JTextArea textArea = new JTextArea(5, 30);
        textArea.setOpaque(false);

        JViewport viewport = new JViewport() {
            @Override
            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                int w = this.getWidth();
                int h = this.getHeight();
                g.setColor(Color.RED);
                g.fillRect(0, 0, w / 2, h / 2);
            }
        };

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setViewport(viewport);
        scrollPane.setViewportView(textArea);

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(scrollPane);
        frame.setLocationByPlatform(true);
        frame.pack();
        frame.setVisible(true);
    }
}