Sams Teach Yourself Java in 21 Days (Covering Java 8 and Android)
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ROGERS CADENHEAD

Day 9: Working with Swing

Certification Practice

Each chapter of the book ends with a Certification Practice question that's comparable to what you could expect to be asked on a Java certification test. Here's the answer for chapter 9:

Answer (b) is correct. Without a default close operation such as JFrame.EXIT_ON_CLOSE, the Display application will never stop running after the frame is closed[md]you must hit CTRL-C to terminate the program.

Answer (a) is incorrect. The frame displays properly even if its size is not explicitly set. The call to the pack() statement in its constructor method sets the size based on the size of the JLabel component inside the frame.

Answer (c) is incorrect. Calling the frame's constructor method inside the constructor method causes a stack overflow error when the program runs.

Answer (d) is incorrect because (b) is correct. Edit

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