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Answer and Explanation

Question 5

What output is produced by the program shown in Listing 5 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. ABC DEF GHI
  • D. None of the above.
Listing 5 . Listing for Question 5.
import java.util.ArrayList; public class Ap145{public static void main( String args[]){ new Worker().doIt();}//end main() }//end class Ap145class Worker{ void doIt(){ArrayList ref = null; ref = new ArrayList(1);ref.add("ABC "); ref.add("DEF ");ref.add("GHI");System.out.println( (String)ref.get(0) +(String)ref.get(1) + (String)ref.get(2));}//end doIt() }// end class Worker

Answer and Explanation

Question 6

What output is produced by the program shown in Listing 6 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. ABC DEF GHI
  • D. None of the above.
Listing 6 . Listing for Question 6.
import java.util.ArrayList; public class Ap146{public static void main( String args[]){ new Worker().doIt();}//end main() }//end class Ap146class Worker{ void doIt(){ArrayList ref = null; ref.add("ABC ");ref.add("DEF "); ref.add("GHI");System.out.println((String)ref.get(0) + (String)ref.get(1) +(String)ref.get(2)); }//end doIt()}// end class Worker

Answer and Explanation

Question 7

What output is produced by the program shown in Listing 7 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. ABC DEF GHI
  • D. None of the above.
Listing 7 . Listing for Question 7.
import java.util.ArrayList; public class Ap147{public static void main( String args[]){ new Worker().doIt();}//end main() }//end class Ap147class Worker{ void doIt(){ArrayList ref = null; ref = new ArrayList(1);ref.add("ABC "); ref.add("DEF ");System.out.println((String)ref.get(0) + (String)ref.get(1) +(String)ref.get(2)); }//end doIt()}// end class Worker

Answer and Explanation

Question 8

What output is produced by the program shown in Listing 8 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. Infinity
  • D. None of the above.
Listing 8 . Listing for Question 8.
public class Ap148{ public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Ap148 class Worker{void doIt(){ System.out.println(1.0/0);}//end doIt() }// end class Worker

Answer and Explanation

Question 9

What output is produced by the program shown in Listing 9 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. Infinity
  • D. None of the above.
Listing 9 . Listing for Question 9.
public class Ap149{ public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Ap149 class Worker{void doIt(){ System.out.println(1/0);}//end doIt() }// end class Worker

Answer and Explanation

Question 10

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

  • A. Compiler Error
  • B. Runtime Error
  • C. AB CD EF
  • D. None of the above.
Listing 10 . Listing for Question 10.
public class Ap150{ public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Ap150 class Worker{void doIt(){ String[]ref = {"AB ","CD ","EF "}; for(int i = 0; i<= 3; i++){ System.out.print(ref[i]); }//end forloopSystem.out.println(""); }//end doIt()}// end class Worker

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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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