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Question 9

What output is produced by the program shown in Listing 10 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. Tom
  • D. None of the above.
Listing 10 . Listing for Question 9.
public class Ap159{ public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Ap159 class Worker{void doIt(){ char[]ref = null; System.out.print(ref);System.out.print(" "); ref[0]= 'T'; ref[1]= 'o'; ref[2]= 'm'; System.out.println(ref);}//end doIt() }// end class Worker

Answer and Explanation

Question 10

What output is produced by the program shown in Listing 11 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. Joe Tom
  • D. None of the above.
Listing 11 . Listing for Question 10.
public class Ap160{ public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Ap160 class Worker{void doIt(){ char[]ref = {'J','o','e'}; System.out.print(ref);System.out.print(" "); ref[0]= 'T'; ref[1]= 'o'; ref[2]= 'm'; System.out.println(ref);}//end doIt() }// end class Worker

Answer and Explanation

Listings

I recommend that you open another copy of this document in a separate browser window and use the following links to easilyfind and view the listings while you are reading about them.

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Ap0140: Self-assessment, Type conversion, casting, common exceptions, public class files, javadoc commentsand directives, and null references
  • File: Ap0140.htm
  • Originally published: 2004
  • Published at cnx.org: 12/18/12
  • Revised: 12/03/14
Disclaimers:

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I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

Answers

Answer 10

C. Joe Tom

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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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