The Java class used to show option panes is called JOptionPane. JOptionPane belongs to the javax.swingpackage, so you’ll need to import this package to use it. (“Swing” is the name of one of Java’s GUI libraries.) Note that the package name starts

This tutorial has showed how to respond to a simple button event. There are many more events you can have your application respond to. The IDE can help you find the list of available events your GUI components can handle: Go back to the file NumberAdditio

The Java Swing library is built on top of the Java Abstract Widget Toolkit (AWT), an older, platform dependent GUI toolkit.You can use the Java GUI programming components like button, textbox, etc. from the library and do not have to create the components