Exception in thread "main" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at BT68Gui.<init>(BT68Gui.java:15)
at AT68Gui.main(AT68Gui.java:8)
I am finding it difficult to progress the way I’d like too if I keep hitting this brick wall any help will be greatly appreciated I am using Eclipse to write my java programs. Eclipse works through c:\users\owner\workspace ;My png files are in workspace.
Code:
BT68Gui.java program
/ java tutorial 68 JRadioButton
// Java tutorial 67 final JRadioButton
// Java tutorial 69 Drop down list program
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class BT68Gui extends JFrame{
private JComboBox box;
private JLabel picture;
private static String[] filename = {"b.png, x.png"};// and Array with two elements this Array stores the filename
private Icon[] pics = {new ImageIcon(getClass().getResource(filename[0])), new ImageIcon(getClass().getResource(filename[1]))}; // This Array stores the pictures filename 0 is the first element of the Aray
public BT68Gui(){
super("The Title");
setLayout(new FlowLayout());
box = new JComboBox(filename);
box.addItemListener(
new ItemListener(){ // Anonymous inner class
public void itemStateChanged(ItemEvent event){
if(event.getStateChange()==ItemEvent.SELECTED)
picture.setIcon(pics[box.getSelectedIndex()]);
}// Anonymous inner Class
}
);
add(box);
picture = new JLabel(pics[0]);
add(picture);
}
}
AT68Gui.java program
//^java tutorial 60 Simple Polymorphic Program
import javax.swing.JFrame;//*Creates the window
public class AT68Gui {
public static void main(String[] args){
BT68Gui go = new BT68Gui();
go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
go.setSize(300,200);
go.setVisible(true);
}
}
