Wednesday 27 December 2017
java - JPanel not showing up on JFrame
Answer
Answer
I'm trying to draw some filled
rectangles on a JPanel and add that panel to a JFrame but when I run the program all I
see is the JFrame. I added the JPanel using frame.add(new so I'm not sure why the panel is not showing
RectanglePanel());
up.
Frame
class:
package
h02;
import javax.swing.*;
// frame
and its properties
public class RectangleFrame extends JFrame
{
public RectangleFrame() {
// JFrame
object
JFrame frame = new
JFrame();
// properties
frame.setSize(300, 200);
frame.setLocationRelativeTo(null); // frame in
centre
frame.setTitle("Drawing rectangles");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new
RectanglePanel());
frame.setVisible(true);
}
public
static void main(String[] args) {
new RectangleFrame();
}
}
Panel
class:
package
h02;
import javax.swing.*;
import
java.awt.*;
public class RectanglePanel extends JPanel
{
// drawing the rectangles
public
void PaintComponent(Graphics g) {
super.paintComponent(g);
g.fillRect(110, 110, 20, 20);
g.fillRect(10, 10, 30, 120);
g.fillRect(60, 10, 60, 100);
g.fillRect(150, 10, 10, 20);
g.fillRect(240, 10, 10, 20);
g.fillRect(190, 30, 80, 30);
g.fillRect(210, 50, 60,
20);
g.fillRect(190, 70, 80, 50);
g.fillRect(300, 30, 50,
90);
g.fillRect(330, 10, 30, 20);
}
}
Answer
public void
PaintComponent(Graphics g)
{
should
be
@Override
protected
void paintComponent(Graphics g) {
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