Answers to Self-Test Questions

  1. 1. The following are all legal variable names:

    rate1, TimeLimit, numberOfWindows

    TimeLimit is a poor choice, however, since it violates the normal convention that variables should start with a lowercase letter. A better choice would be timeLimit. 1stPlayer is illegal because it starts with a digit. myprogram.java is illegal because it contains an illegal character, the dot. Finally, long is illegal as a variable because it is a keyword.

  2. 2. Yes, a Java program can have two different variables with the names aVariable and avariable, since they use different capitalization and so are different identifiers in Java. However, it is not a good idea to use identifiers that differ only in the way they are capitalized.

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