Image Class is a Abstract Class ? ?

[sameer khazi]

Hi there..i am working on a program where i am adding few widgets(components) on the panel.

Now i could add a button to the frame, and also add a panel carrying a circle widget. but when i try to add a image on the panel and in turn on a frame, i get the error as : java.awt.Image is an abstract class. Now i know since the abstract classes cannot be instantiated.

then how could i add my image on the panel?

import java.awt.*;
import javax.swing.*;
public  class MyImage extends JPanel
{
public void paintComponent(Graphics g)
{
Image image=new ImageIcon("sameer15.jpg" ).getImage();
g.drawImage(image,3,4,this);
}
} 

Now , the following is the code where i am trying to add a button, a oval widget and also a image(as represented by the above program).

   
 
//the circle changes the color each time you click the button
 
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
 
public class SimpleGui3C implements ActionListener
{
JFrame frame;
public static void main(String args[])
{
SimpleGui3C gui=new SimpleGui3C();
gui.go();
} //end of main
 
public void go()
{
frame=new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton button=new JButton("Change Colors");
button.addActionListener(this);
 
MyDrawPanel mypanel=new MyDrawPanel();//this line adds the oval
 
MyImage image=new Image();//similarly i want to add the image..
 
frame.getContentPane().add(BorderLayout.SOUTH,button);
frame.getContentPane().add(BorderLayout.CENTER,mypanel);
frame.getContentPane().add(BorderLayout.NORTH,image);
 
frame.setSize(300 ,300);
frame.setVisible(true);
 
}
public void actionPerformed(ActionEvent event)
{
frame.repaint();
}
}
 

but now when i am compiling this program the following error is what i get:

C:\JPM\gui>javac SimpleGui3C.java
SimpleGui3C.java:34: java.awt.Image is abstract; cannot be instantiated
MyImage image=new Image();
^
1 error

I would like to ask the members to give hints and allow me to work out this program so that i shall learn the basics.

Thank you...kindly co-operate if anything wrong in representing.

[Rob Spoor]

Don't you mean "new MyImage"? Because that's the name of your class, not image.


There is a problem with your approach. You create a new JPanel subclass for the image (which could work), but you haven't provided its size. Therefore, it will have a preferred size of 0 by 0 pixels, and probably not display at all.

If you just want to display an image, JLabel is a better solution:

Icon icon = new ImageIcon("sameer15.jpg");
JLabel image = new JLabel(icon);

[ September 27, 2008: Message edited by: Rob Prime ]