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Part of a self-assessment test designed to help you determine how much you know about method overloading in Java.

Table of contents

Preface

This module is part of a self-assessment test designed to help you determine how much you know about object-orientedprogramming using Java.

The test consists of a series of questions with answers and explanations of the answers.

The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back.

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

Questions

Question 1 .

What output is produced by the program shown in Listing 1 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. 9 17.64
  • D. None of the above
Listing 1 . Listing for Question 1.
public class Ap079{ public static void main(String args[]){new Worker().doOverLoad(); }//end main()}//end class definition class Worker{public void doOverLoad(){ int x = 3;double y = 4.2; System.out.println(square(x) + " "+ square(y)); }//end doOverLoad()public int square(int y){return y*y; }//end square()public double square(double y){return y*y; }//end square()}// end class

Answer and Explanation

Question 2

What output is produced by the program shown in Listing 2 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. float 9.0 double 17.64
  • D. None of the above
Listing 2 . Listing for Question 2.
public class Ap080{ public static void main(String args[]){new Worker().doOverLoad(); }//end main()}//end class definition class Worker{public void doOverLoad(){ int x = 3;double y = 4.2; System.out.print(square(x) + " ");System.out.print(square(y)); System.out.println();}//end doOverLoad()public float square(float y){ System.out.print("float ");return y*y; }//end square()public double square(double y){System.out.print("double "); return y*y;}//end square() }// end class

Answer and Explanation

Question 3

What output is produced by the program shown in Listing 3 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. 10 17.64
  • D. None of the above
Listing 3 . Listing for Question 3.
public class Ap081{ public static void main(String args[]){new Worker().doOverLoad(); }//end main()}//end class definition class Worker{public void doOverLoad(){ double w = 3.2;double x = 4.2;int y = square(w); double z = square(x);System.out.println(y + " " + z);}//end doOverLoad()public int square(double y){ return (int)(y*y);}//end square()public double square(double y){ return y*y;}//end square() }// end class

Answer and Explanation

Question 4

What output is produced by the program shown in Listing 4 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. 9 17.64
  • D. None of the above
Listing 4 . Listing for Question 4.
public class Ap083{ public static void main(String args[]){new Worker().doOverLoad(); }//end main()}//end class definition class Worker{public void doOverLoad(){ int w = 3;double x = 4.2; System.out.println(new Subclass().square(w) + " " + new Subclass().square(x));}//end doOverLoad() }// end classclass Superclass{ public double square(double y){return y*y; }//end square()}//end class Superclass class Subclass extends Superclass{public int square(int y){ return y*y;}//end square() }//end class Subclass

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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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