How to Create a Java application to draw different figures using AWT?

The following program demonstrates How to Create a Java application to draw different figures using AWT.

Creating a Java application to draw different figures using AWT (Abstract Window Toolkit) involves creating a Canvas or a Panel and overriding its paint method to draw various shapes and figures. The following code shows a simple Java application that draws different figures using AWT.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class DrawingFigures extends JFrame {
    private DrawingPanel drawingPanel;

    public DrawingFigures() {
        setTitle("Drawing Figures");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        drawingPanel = new DrawingPanel();
        add(drawingPanel);

        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            new DrawingFigures();
        });
    }

    class DrawingPanel extends JPanel {
        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);

            // Draw a rectangle
            g.setColor(Color.RED);
            g.fillRect(50, 50, 100, 60);

            // Draw an ellipse
            g.setColor(Color.BLUE);
            g.fillOval(200, 50, 80, 80);

            // Draw a line
            g.setColor(Color.GREEN);
            g.drawLine(50, 200, 250, 200);

            // Draw a triangle
            int[] xPoints = {150, 200, 100};
            int[] yPoints = {250, 300, 300};
            int numPoints = 3;
            g.setColor(Color.ORANGE);
            g.fillPolygon(xPoints, yPoints, numPoints);
        }
    }
}

In this program:

We create a DrawingFigures class that extends JFrame to create the main window.
Inside the DrawingFigures constructor:
- We set the title, size, and default close operation for the window.
- We create a DrawingPanel object and add it to the frame.
The DrawingPanel class is an inner class that extends JPanel and overrides its paintComponent method. Inside this method, we use the Graphics object to draw various shapes:
- A red filled rectangle at (50, 50) with dimensions 100×60.
- Another blue filled ellipse at (200, 50) with dimensions 80×80.
- Furthermore, a green line from (50, 200) to (250, 200).
- Finally, an orange filled triangle defined by arrays of x and y coordinates.
In the main method, we use SwingUtilities.invokeLater to create the DrawingFigures object on the Event Dispatch Thread.

Compile and run this program to see how it draws different figures using AWT on a JFrame. You can customize the shapes, colors, and positions as needed.

Further Reading