problem with the code

[in.anurag Singh]

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



public class paintpro {
JFrame frame;
JComboBox cbcolor,cbfigure;

drawrectangle drb;           //this is a class extending JPanel and containg the code to draw rectangle.

paintpro()
{
	
	frame=new JFrame();
	frame.setLayout(null);
	cbcolor=new JComboBox();
	cbfigure=new JComboBox();
		
	cbcolor.addItem("Red");
	cbcolor.addItem("blue");
	
	cbfigure.addItem("Rectangle");
	cbfigure.addItem("Line");
	
	cbcolor.setBounds(50,50, 100, 100);
	cbfigure.setBounds(50,170,100,100);
		
	drb=new drawrectangle();    //this makes the object of the class extending JPanel and containing the code to draw rectangle
	drb.setBounds(200,50,150,50);
	frame.getContentPane().add(drb);        //the object is added to the content pane
	
	frame.getContentPane().add(cbcolor);
	frame.getContentPane().add(cbfigure);
	
	
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	
	frame.setSize(400,400);
	frame.setLocation(100,100);
	frame.setVisible(true);
}
public static void main(String args[])
{
		paintpro paintobj=new paintpro();
}





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

public class drawrectangle extends JPanel {
public void paintComponent(Graphics g)
{
	
	super.paintComponent(g);       // i have tried to remove this line but still the rectangle is not appearing.
	g.drawRect(200,50,150,100);
	
}

}

  

I have a problem with the above code.
The program is compiling successfully and is running but i am not getting the panel containing rectangle on the main Frame.
The main Frame is displaying only the comboboxes, there should be a rectangle also..

Please solve the problem..

[Jhedzkie Skies]

please use codetags next time.

[in.anurag Singh]

oh..yes..
i will take care of that..this is my first time to have the problem with the code so sorry..

[Maneesh Godbole]

You can use the button to incorporate the code tags in your original post

[pete stein]

Your drawrectangle class as shown:

  class drawrectangle extends JPanel {
    public void paintComponent(Graphics g) {
      super.paintComponent(g); 
      g.drawRect(200, 50, 150, 100);
    }
  }

attempts to draw a 150 x 100 point rectangle with the rectangle's top left corner at [200, 50]. However when you create one in your main class:

    drb = new drawrectangle();
    drb.setBounds(200, 50, 150, 50);

you only give it a size of 150 x 50, so how will this rectangle ever show if it starts at 200, 50?

Also, you avoid using null layout and setBounds but instead let layout managers do the component laying for you.

[in.anurag Singh]

  
drb=new drawrectangle();
	drb.setBounds(200,50,152,102);
	frame.getContentPane().add(drb);
  

  
public class drawrectangle extends JPanel {
public void paintComponent(Graphics g)
{
	
	super.paintComponent(g);
	g.drawRect(1,1,150,100);
	//repaint();
}

}
  

Thanks,
This makes my code run and a rectangle is now appearing..
Thanks a lot..

I will now try this by layout managers..