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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.
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.
Given: The use of String concatenation in the argument list of the call to the println method in the program shown in Listing 1 will cause seven items to be displayed on the screen, separated by spaces.
True or False? The program produces the output shown below:
false true false false true true false |
| Listing 1 . Listing for Question 1. |
|---|
public class Ap025{
public static void main(String args[]){new Worker().doRelat();
}//end main()}//end class definition
class Worker{public void doRelat(){
int a = 1, b = 2, c = 3, d = 2;System.out.println(
(a == b) + " " +(b == d) + " " +
(b != d) + " " +(c<a) + " " +
(b<= d) + " " +
(c>d) + " " +
(a>= c));
}//end doRelat()}//end class definition |
What output is produced by the program shown in Listing 2 ?
| Listing 2 . Listing for Question 2. |
|---|
public class Ap026{
public static void main(String args[]){new Worker().doRelat();
}//end main()}//end class definition
class Worker{public void doRelat(){
Dummy x = new Dummy();Dummy y = new Dummy();
System.out.println(x == y);}//end doRelat()
}//end class definitionclass Dummy{
int x = 5;double y = 5.5;
String z = "A String Object";}//end class Dummy |
What output is produced by the program shown in Listing 3 ?
| Listing 3 . Listing for Question 3. |
|---|
public class Ap027{
public static void main(String args[]){new Worker().doRelat();
}//end main()}//end class definition
class Worker{public void doRelat(){
Dummy x = new Dummy();Dummy y = new Dummy();
System.out.println(x.equals(y));}//end doRelat()
}//end class definitionclass Dummy{
int x = 5;double y = 5.5;
String z = "A String Object";}//end class Dummy |
What output is produced by the program shown in Listing 4 ?
| Listing 4 . Listing for Question 4. |
|---|
public class Ap028{
public static void main(String args[]){new Worker().doRelat();
}//end main()}//end class definition
class Worker{public void doRelat(){
Dummy x = new Dummy();Dummy y = x;
System.out.println((x == y) + " " + x.equals(y));
}//end doRelat()}//end class definition
class Dummy{int x = 5;
double y = 5.5;String z = "A String Object";
}//end class Dummy |
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