Hello folks, I recently started learning Java and bought a book to look at some examples. When I copied this example program out of the book I get a null pointer exception. Most of the other programs worked perfectly this is the only one iv had a problem with so far. At first i thought it was because I didn't have an image called bug1.gif in the same folder as my java files however that was not the case.
The error I get is
Exception in thread "main" java.lang.NullPointerException
at javax.swing.ImageIcon.(init)(ImageIcon.java:167)
at LabelFrame.(init)(LabelFrame.java:23)
at LabelTest.main(LabelTest.java:7)
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.Icon;
import javax.swing.ImageIcon;
public class LabelFrame extends JFrame
{
private JLabel label1;
private JLabel label2; // ImageIcon
private JLabel label3;
public LabelFrame()
{
super("Testing JLabel");
setLayout(new FlowLayout());
label1 = new JLabel("Label with Text");
label1.setToolTipText("This is label1");
add(label1);
Icon bug = new ImageIcon(getClass().getResource("bug.gif"));
label2 = new JLabel("Label with text and icon",bug,SwingConstants.LEFT);
label2.setToolTipText("This is label2");
add(label2);
label3 = new JLabel();
label3.setText("Label with icon and text at bottom");
label3.setIcon(bug);
label3.setHorizontalTextPosition(SwingConstants.CENTER);
label3.setVerticalTextPosition(SwingConstants.BOTTOM);
label3.setToolTipText("This is label3");
add(label3);
}
}import javax.swing.JFrame;
public class LabelTest
{
public static void main(String args[])
{
LabelFrame labelFrame = new LabelFrame();
labelFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
labelFrame.setSize(275,180);
labelFrame.setVisible(true);
}
}