How to close a GUI when i push a JButton

Question

Does anyone know how to make a jbutton close a gui? I think it is like System.CLOSE(0); but that didnt work. it also could be exitActionPerformed(evt);

Answer 1

In Java 8, you can use Lambda expressions to make it simpler.

Close application

JButton btnClose = new JButton("Close");
btnClose.addActionListener(e -> System.exit(0));

Close window

JButton btnClose = new JButton("Close");
btnClose.addActionListener(e -> this.dispose());