Question

Possible Duplicate:
paintComponent () never executes on a JFrame

I am using the following code to dispaly two strings and i’m drawing them directly on jfame instead of adding them as component or to a jpanel.But Why am i getting a blank window instead of getting Strings.Where am i wrong?

import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JFrame;
import javax.swing.SwingUtilities;


public class SimpleAttributes extends JFrame{

SimpleAttributes()
{

    super("Simple Attributes");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(300, 200);
    //setUndecorated(true);
    Container cp=this.getContentPane();
    cp.setBackground(new Color(0,200,0,0));

    setVisible(true);
}

public void paintComponent(Graphics g)
{
    Graphics2D g2=(Graphics2D)g.create();
    g2.setColor(Color.RED);
    g2.drawString("One", 10, 10);

    g.drawString("Two", 10,40);

}
public static void main(String[] args) {
    // TODO Auto-generated method stub
SwingUtilities.invokeLater(new Runnable(){public void run(){new SimpleAttributes();}});
}

}

Answer 1

JFrame is not a component, therefor there’s no paintComponent() function for it. See the API documentation.