SwingPaintDemo

Adapted from demos in the Java Tutorial.

import javax.swing.SwingUtilities;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.BorderFactory;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;

public class SwingPaintDemo {
   
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI(); 
            }
        });
    }

    private static void createAndShowGUI() {
        System.out.println("Created GUI on EDT? "+
        SwingUtilities.isEventDispatchThread());
        JFrame f = new JFrame("Swing Paint Demo");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new MyPanel());
        f.pack();
        f.setVisible(true);
    }
}

class MyPanel extends JPanel {

    public MyPanel() {
        setBorder(BorderFactory.createLineBorder(Color.black));
    }

    public Dimension getPreferredSize() {
        return new Dimension(200,200);
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);       

        // Deathly Hallows Symbol
        int x[] = {10, 190, 100};
        int y[] = {190, 190, 25};
        g.drawPolygon(x, y, 3);
        g.drawOval(48 , 86 , 104, 104);
        g.drawLine(100, 190, 100, 25);

    }  
}

import javax.swing.SwingUtilities;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.BorderFactory;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

public class SwingPaintDemo {

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {

public void run() {

createAndShowGUI();

}

});

}

private static void createAndShowGUI() {

System.out.println("Created GUI on EDT? "+

SwingUtilities.isEventDispatchThread());

JFrame f = new JFrame("Swing Paint Demo");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.add(new MyPanel());

f.pack();

f.setVisible(true);

}

class MyPanel extends JPanel {

public MyPanel() {

setBorder(BorderFactory.createLineBorder(Color.black));

}

public Dimension getPreferredSize() {

return new Dimension(200,200);

}

public void paintComponent(Graphics g) {

super.paintComponent(g);

// Deathly Hallows Symbol

int x[] = {10, 190, 100};

int y[] = {190, 190, 25};

g.drawPolygon(x, y, 3);

g.drawOval(48 , 86 , 104, 104);

g.drawLine(100, 190, 100, 25);

}

Hi There!