Java2D Example

App.java

package com.example;

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class App extends JFrame {
	private static final long serialVersionUID = -1212074721130125123L;

	public App() {
		add(new Gfx());

		setTitle("Simple Java 2D example");
		setSize(300, 200);
		setLocationRelativeTo(null);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			@Override
			public void run() {
				App ex = new App();
				ex.setVisible(true);
			}
		});
	}
	
	public class Gfx extends JPanel {
		private static final long serialVersionUID = -30883400631899767L;

		@Override
		public void paintComponent(Graphics g) {
			super.paintComponent(g);
			System.out.println("here");
			Graphics2D g2 = (Graphics2D) g;
			g2.setPaint(Color.RED);
			g2.fill(new Rectangle2D.Double(10, 5, 20, 20));
			g2.setPaint(Color.BLACK);
		}
	}
}

Thank you so much! This has helped our team so much! Hope you have a good time with all of the presentations tomorrow.