Oracle Java Tutorial（Oracle Java官方教程, 基于JDK发1.8，CHM格式，全英文） 甲骨文Java官方教程，涉及Java的各个方面，数据结构，并发，IO，网络，环境，反射，泛型，图形界面，JDBC，JAXB等，层次清晰，案例鲜明。可以在Oracle官网浏览，本资源提供CHM格式便于查阅。

In Part 4, you added a JButton to your window. You could see it, you could click it, but nothing happened. In Part 6, you learned how to display multiple components using FlowLayout. Now it is time to ...