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This module is part of a self-assessment test designed to help you determine how much you know about object-orientedprogramming using Java.
Questions and answers
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.
Programming challenge questions
The module also contains a section titled Programming challenge questions . This section provides specifications for one or more programs that you should be able to write once you understand the answersto all of the questions. (Note that it is not always possible to confine the programming knowledge requirement to this and earlier modules. Therefore, youmay occasionally need to refer ahead to future modules in order to write the programs.)
Unlike the other questions, solutions are not provided for the Programming challenge questions . However, in most cases, the specifications will describe the output that your program should produce.
Listings
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.
What output is produced by the program shown in Listing 1 ?
| Listing 1 . Listing for Question 1. |
|---|
public class Ap010{
public static void main(String args[]){new Worker().doAsg();
}//end main()}//end class definition
class Worker{public void doAsg(){
double myVar;myVar = 3.0;
myVar += 4.0;System.out.println(myVar);
}//end doAsg()}//end class definition |
What output is produced by the program shown in Listing 2 ?
| Listing 2 . Listing for Question 2. |
|---|
public class Ap011{
public static void main(String args[]){new Worker().doAsg();
}//end main()}//end class definition
class Worker{public void doAsg(){
double myDoubleVar;//Integer.MAX_VALUE = 2147483647
int myIntVar = Integer.MAX_VALUE;myDoubleVar = myIntVar;
System.out.println(myDoubleVar);}//end doAsg()
}//end class definition |
What output is produced by the following program?
| Listing 3 . Listing for Question 3. |
|---|
public class Ap012{
public static void main(String args[]){new Worker().doAsg();
}//end main()}//end class definition
class Worker{public void doAsg(){
//Integer.MAX_VALUE = 2147483647double myDoubleVar =
Integer.MAX_VALUE;int myIntVar;
myIntVar = myDoubleVar;System.out.println(myIntVar);
}//end doAsg()}//end class definition |
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