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Discussion :: Declarations and Access Control

  1. Which two statements are true for any concrete class implementing the java.lang.Runnable interface?

    1. You can extend the Runnable interface as long as you override the public run() method.
    2. The class must contain a method called run() from which all code for that thread will be initiated.
    3. The class must contain an empty public void method named run().
    4. The class must contain a public void method named runnable().
    5. The class definition must include the words implements Threads and contain a method called run().
    6. The mandatory method must be public, with a return type of void, must be called run(), and cannot take any arguments.

    2. A.
    1 and 3
    B.
    2 and 4
    C.
    1 and 5
    D.
    2 and 6

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    Answer : Option D

    Explanation :

    (2) and (6). When a thread's run() method completes, the thread will die. The run() method must be declared public void and not take any arguments.

    (1) is incorrect because classes can never extend interfaces. (3) is incorrect because the run() method is typically not empty; if it were, the thread would do nothing. (4) is incorrect because the mandatory method is run(). (5) is incorrect because the class implements Runnable.

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