How to create a rectangle in a rectangle?

Question

In my paintComponent, I have drawRect, which draws a single rectangle. However, I want to make the outline of the rectangle thicker but I don't know how. So I thought of making another rectangle inside the existing one. I tried putting another drawRect but the rectangle isn't in the center.

Thanks for those who'll help!

Answer 1

g2d.setStroke(new BasicStroke(6));

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The argument passed to the paintComponent(Graphics) method of a Swing component should actually be a Graphics2D instance. It can be cast to one.

See this example in which 3 strokes are layered.

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

class StrokeIt {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                StrokePanel sp = new StrokePanel();
                sp.setPreferredSize(new Dimension(400,100));
                sp.setBackground(Color.BLUE);
                JOptionPane.showMessageDialog(null, sp);
            }
        });
    }
}

class StrokePanel extends JPanel {

    int pad = 12;

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D)g;

        g2d.setColor(Color.RED);
        g2d.setStroke(new BasicStroke(10));
        g2d.drawRect( 0+pad, 0+pad,
            getWidth()-(2*pad), getHeight()-(2*pad) );

        g2d.setColor(Color.YELLOW);
        g2d.setStroke(new BasicStroke(6));
        g2d.drawRect( 0+pad, 0+pad,
            getWidth()-(2*pad), getHeight()-(2*pad) );

        g2d.setColor(Color.ORANGE);
        g2d.setStroke(new BasicStroke(2));
        g2d.drawRect( 0+pad, 0+pad,
            getWidth()-(2*pad), getHeight()-(2*pad) );
    }
}