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Use mouse to expend cs.ecl.basics.simple, I can see src and JRE System Library.
4. Creating a Java class
In package explorer, right click on src folder, and select new->class, type student, and click enter key. Actually Library.java is a class, I'm going to use it as an example instead of student.java.
5. Editing Java elements
In Library.java, I use source generator added following code:
6. Renaming Java elements
I changed Video.java to Audio.java by changing the interface name.
