Java Graphics How to - Draw your own Icon with paintIcon() method

Question

We would like to know how to draw your own Icon with paintIcon() method.

Answer

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.GridLayout;
//  w w  w .ja v  a 2  s .  c  o  m
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    JLabel label = new JLabel(new ElliptIcon(380, 260, Color.red));
    label.setLayout(new GridLayout(2, 2));
    frame.setContentPane(label);
    for (int i = 0; i < 4; i++) {
      label.add(new JLabel(new ElliptIcon(100, 60, Color.blue)));
    }
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
  }
}
class ElliptIcon implements Icon {
  private int w, h;
  private Color color;

  public ElliptIcon(int w, int h, Color color) {
    this.w = w;
    this.h = h;
    this.color = color;
  }

  @Override
  public void paintIcon(Component c, Graphics g, int x, int y) {
    g.setColor(color);
    g.fillOval(x, y, w, h);
  }

  @Override
  public int getIconWidth() {
    return w;
  }

  @Override
  public int getIconHeight() {
    return h;
  }
}