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

Day 10: Building a Swing Interface

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 10:

Answer (c) is correct. A call to super(), the constructor method of a superclass, must always be the first line in a constructor method. The compiler fails and displays the message "call to super() must be first statement in constructor."

Answer (b) is incorrect because the source code does not compile. However, it is true that nothing is displayed in the frame[md]the slider component was never added to the frame.

Answer (a) is incorrect because the source code does not compile and does not run successfully[md]the frame is displayed but nothing is shown in the frame. The slider component was never added to the frame.

Answer (d) is incorrect because the call to add() is correct. Edit

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