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when I execute the above code it generates :

"Exception in thread "main" java.lang.NullPointerException
at test.hyperlikntest.main(hyperlikntest.java:29)"

I was wondering what is the reason

noooooooo answer

import java.awt.FlowLayout;

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JPanel;
import...