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I click on that, it switched to Audio.java.
11.Running your programs
I added changed the following code main in Library.java: public static void main(String[] args) { System.out.println("Hello"); Audio a = null; Library<Audio> La = new Library<Audio>(); La.addMedia(a); System.out.println(La.retrieveLast()); } I clicked run, it shows: Hello null 12.Debugging your programs
13.Evaluating expressions
14.Evaluating snippets
15.Using the Java browsing perspective
16.Writing and running JUnit tests
