Am 26.02.20 um 12:09 schrieb Hans Grimmelshausen HG:
5) Create a new Swing GUI form class, add to it with Netbeans' GUI designer
a visual component which can have an action event, like a JCheckBox, then
register an action event, i.e. double click on the JCheckBox component, so
that NB creates an actionPerformed event method in the source code.
Or simply use offending source code lines manually, like in the following
mini Java class. With NB's enabled "Overrides" hint and un-installed nb-javac
plug-in, in order to make NB bring a null-pointer exception during editing:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JCheckBox;
public class Test {
public static void main(String[] parameter) {
JCheckBox jCheckbox = new JCheckBox();
jCheckbox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
}
});
}
}
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