2
I am using Netbeans, but I want to change the default icon of my application. But, I came across this error.
Follows the code:
import java.awt.Toolkit;
/**
*
* @author renato.lazaro
*/
public class IconJFrame extends javax.swing.JFrame {
/**
* Creates new form IconJFrame
*/
public IconJFrame() {
initComponents();
setIcon();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(IconJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(IconJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(IconJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(IconJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new IconJFrame().setVisible(true);
}
});
}
private void setIcon() {
setIconImage ( Toolkit . getDefaultToolkit (). getImage ( getClass (). getResource ( "iconframe.png" )));
}
// Variables declaration - do not modify
// End of variables declaration
}
Another error that occurred:
Just import the class, no!?
– Renan Gomes
I imported it to java awt Toolkit, but the Application returns with error. Exception in thread "AWT-Eventqueue-0" java.lang.Nullpointerexception
– Renato Lazaro
So the problem is no longer that of the question, probably the Resource informed in the code is going null, add the code here so we can analyze.
– user28595
I used as reference the example of the https://www.youtube.com/watch?v=40ikcEonWng video However, it returns with error, if someone has another solution and may be helping.
– Renato Lazaro
Add the code to the question, and a printscreen of the package hierarchy of your project, where the icon image is.
– user28595