Scope and life of a $var

Question

hello,
I dont understand ...many things :)
I am trying to get a picture and put it on a button
but when i try to compile i get this....
mohadib@ns2 /var/www/html/java--->javac space.java
space.java:25: cannot resolve symbol
symbol : variable pic
location: class space
JButton my_button = new JButton(pic);
^
1 error
any advice would be great. code below
Thanks,
jd
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
public class space extends JApplet{
     public void init(){
          setContentPane(makeContentPane());
     public Container makeContentPane(){
          JPanel main_pane = new JPanel();
          JPanel main_panel = new JPanel();
          try{
               URL pic_url = new             URL("http://ns2.taproot.bz/java/prima_interface/thumbs/1.jpg");
               ImageIcon pic = new ImageIcon(pic_url);
          catch(MalformedURLException e){
               System.out.println(e);
          JButton my_button = new JButton(pic);
          main_panel.add(my_button);
          main_pane.add(main_panel);
          return main_pane;
}

Answer 1

You have no variable called pic in your program.
If you meant pic_url, you'll get a problem because the scope of a local variable is the block in which it is declared.
You need to take the pic_url definition outside of the try block for your program to work, ie
URL pic_url = null;
try{
  URL pic_url = new URL ("http://ns2.taproot.bz/java/prima_interface/thumbs/1.jpg");
  ImageIcon pic = new ImageIcon(pic_url);          
catch(MalformedURLException e)
   System.out.println(e);          
if ( pic_url != null )
   JButton my_button = new JButton(pic_url);