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If I use mouse to move Video.java to Media.java, it's the same as copying.
8. Navigate to a Java element's declaration
In Library.java, I hightlight Media, the Media became gray background.
Then I right click on Media, and select open declearation, it switch to
Media.java.
9. Viewing the type Hierarchy
In Media.java, I hightlight Media, the Media became gray background.
Then I right click on Media, and select open type hierarchy.
The left panel show Media as a menu, Audio, Book, Video as sub menu.
10.Searching the workbench
11.Running your programs
12.Debugging your programs
