Set an icon to a second jLabel if the first jLabel is disabled

Question

I have two jLabels. When a button is pressed, it would set the icon to the JLabel and disable it. So when a second button is pressed, it would check if the first jLabel is disabled and set the icon for the next jLabel. Here's my code for one button(it's the same for the rest of the buttons):

private void choice1ActionPerformed(java.awt.event.ActionEvent evt) {
choice1.setEnabled(false);
    if(letter1.isEnabled()) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter1.setIcon(ima);
    }
    if(letter1.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter2.setIcon(ima);
    }
    if(letter2.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter3.setIcon(ima);
    }
    if(letter3.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter4.setIcon(ima);
    }
    if(letter4.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter5.setIcon(ima);
    }
    if(letter5.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter6.setIcon(ima);
    }
    if(letter6.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter7.setIcon(ima);
    }
    if(letter7.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter8.setIcon(ima);
    }
    if(letter8.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter9.setIcon(ima);
    }
    if(letter9.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter10.setIcon(ima);
    }
    if(letter10.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter11.setIcon(ima);
    }
    if(letter11.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter12.setIcon(ima);
}
    if(letter12.isEnabled()==false) {
        Icon ima = new ImageIcon(this.getClass().getResource("/replaceletter/lettera2"));
        letter13.setIcon(ima);
    }
}

There is an exception (NullPointerException). And it is unable to set the icon for the jLabel. I don't know what I'm doing wrong. Any suggestions would be very much appreciated.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(ImageIcon.java:205)
at Game.GeneticsWord3.choice1ActionPerformed(GeneticsWord3.java:440)
at Game.GeneticsWord3.access$1200(GeneticsWord3.java:13)
at Game.GeneticsWord3$13.actionPerformed(GeneticsWord3.java:244)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at Game.GeneticsWord3.choice1ActionPerformed(GeneticsWord3.java:440)    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6516)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6281)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4872)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:747)
at java.awt.EventQueue.access$300(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:706)
at java.awt.EventQueue$3.run(EventQueue.java:704)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:720)
at java.awt.EventQueue$4.run(EventQueue.java:718)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:717)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

Is `this.getClass().getResource("/replaceletter/lettera2")` causing the exception? — achAmháin, May 10 '18 at 12:37
Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — yole, May 10 '18 at 12:38
If you want an img to be loaded from the classpath, you must be percise with its name. /com/mypackage/myimg.png its an example. — George Z., May 10 '18 at 16:48

Set an icon to a second jLabel if the first jLabel is disabled

0 Answers0