NullPointerException for some reason

Asked Mar 11 '16 at 12:32

Active Mar 11 '16 at 12:32

Viewed 29 times

I am writing this program using the javax.swing library. The "purpose" of the program is that when you push button one the text of the label says button1 if you push button 2 the text of the label says button 2

right.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent ae){
            label.setText("right")          }
    });

for some reason this creates a null pointer exception. I really don't get this. Can you guys help me?

Kind regards

asked Mar 11 '16 at 12:32

sir_dec

It gets an NPE because the `label` hasn't been set. You need to make sure it is set before you use it. – Peter Lawrey Mar 11 '16 at 12:33
the label was set but the right was not set :( I am very sorry :) – sir_dec Mar 11 '16 at 12:34
You mean the `"right"` string or did you make that bit up? – Peter Lawrey Mar 11 '16 at 12:35
This is where a debugger is very helpful in debugging your code. – Peter Lawrey Mar 11 '16 at 12:36

NullPointerException for some reason

0 Answers0