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Sitting for the Sun Certification Exams

1. Which of the following is not a
   public method or instance variable of
   java.lang.String?

a) String.length
b) String.size
c) String.getLength()
d) String.length()

The only valid public method is String.length().

2. What keyword is used to specify a class
   variable?

a) final
b) public
c) static
d) private

The static keyword indicates a variable is shared by all instances of a class.

3. Which of the following are valid
   comment(s)?

a) / This is a comment
b) /* This is a comment */
c) (* This is a comment *)
d) // This is a comment

The two valid comment types are // and /* */. A third type /** */ indicates a javadoc comment.

4. Which of the following will not produce
   a compile-time error?

a) public class MyString extends
   java.lang.String
b) class MyClass implements
   java.io.Serializable
c) class NetworkClient

Sorry. That was a trick question. String is marked final, so it cannot be subclassed in a). Your must know your API very well to pass!

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