JFrame, w nim JPanel, na nim narysowany kwadrat
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.LineBorder;
public class Kwadrat extends JFrame {
Panelek p;
public Kwadrat(){
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(null);
setSize(400,400);
setLocation(getToolkit().getScreenSize().width/2 - this.getWidth()/2,
getToolkit().getScreenSize().height/2 - this.getHeight()/2);// zupelnie na srodku
p = new Panelek();
p.setBorder(new LineBorder (Color.black, 1, true));
p.setBounds(50, 50, 200, 200);
getContentPane().add(p);
}
class Panelek extends JPanel{
public void paint(Graphics g){
super.paint(g);
((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON); //antyaliasing ;-]
g.fillRect(50, 50, 40, 40);
}
}
public static void main(String[] args) {
new Kwadrat().setVisible(true);
}
}