How to make a JOptionPane appear at an attempt to close a JFrame

Question

I am currently working on a Java application using a JFrame. What I want, is to have it when someone tries to close the window, it will make a JOptionPane appear asking: "Are you sure you want to exit 3DWorld?" and then have two buttons at the bottom saying Yes and No. Any help would be great!

Thanks.

Answer 1

有关一些基本信息和一些帮助程序类，请参见关闭应用程序 。