Please help in createImage program

Question

Hi,
Following is the code for drawing rectangle using java.awt.Graphics class.
Problem is it is only displaying frame not the rectangle.what's wroung with this?
I am using Image because I need to store the ractangle as a image.Once image is created I can use gifencoder or jpegencoder classes.
I need to solve this soon , I am stuck in the project..please help me out.
import java.awt.Image;
import java.awt.Graphics;
import java.awt.Frame;
import java.awt.Color;
import javax.swing.*;
import java.awt.Component;
public class SaveImage
public static void main(String arg[])
//JFrame f=new JFrame("Save Image");
Component dummy;
dummy= new JFrame("Save Image");
dummy.addNotify();
Image img=dummy.createImage(200,200);
Graphics g=img.getGraphics();
g.setColor(Color.yellow);
g.fillRect(20,20,100,100);
g.drawOval(20,45,25,25);
dummy.setSize(500,500);
dummy.setVisible(true);
Thanks,
padmashree

Answer 1

Thanks for you feedback.
i dont know what u want with the Image???I need Image because , I have to store the the daigram into file like in .jpeg or .bmp format which we need for later use.
I was thinking of using JpegEncoder class. I have downloded the class. Before using that I need to create image first and getGraphics() from image then draw diagram.
I realy don't know how createImage method works and on which object needs to be invoked? Do you?
I have checked on forum I saw someone's code to create image , whichis something like this
Component dummy;
dummy=new Frame();
Image img=dummy.createImage(500,500); OR just Image img=createImage(500,500);
Graphics g=img.getGraphics();
g.drawRectangle(200,200,400,400);
If I use this code in paint( ...g) method I am getting errot and it's not painting .
I have changed the code like,
import java.awt.Image;
import java.awt.Graphics;
import java.awt.Frame;
import java.awt.Color;
import javax.swing.*;
import java.awt.Component;
import java.awt.event.*;
public class SaveImage extends JFrame
Image img;
public SaveImage()
super("Save Image");
img=createImage(300,300);
setSize(500,500);
show();
public static void main(String [] args)
SaveImage app = new SaveImage();
System.out.println("Within main");
System.out.println("After Paint");
public void paint(Graphics g)
System.out.println("Within Paint");
g=img.getGraphics();
g.setColor(Color.yellow);
g.fillRect(20,20,100,100);
g.drawOval(20,45,25,25);
repaint();
Please help me in this I am stuck in the project from yestarday.
Thanks,
Padmashree
but you can just copy what the graphics paints onto
the frame into an img and then to a file
hope it helps
import java.awt.Image;
import java.awt.Graphics;
import java.awt.Frame;
import java.awt.Color;
import javax.swing.*;
import java.awt.Component;
import java.awt.event.*;
public class SaveImage extends JFrame
public SaveImage()
super("Save Image");
setSize(500,500);
show();
public static void main(String [] args)
SaveImage app = new SaveImage();
app.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
public void paint(Graphics g)
g.setColor(Color.yellow);
g.fillRect(20,20,100,100);
g.drawOval(20,45,25,25);
repaint();