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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.
What output is produced by the program shown in Listing 1 ?
| Listing 1 . Listing for Question 1. |
|---|
public class Ap100{
public static void main(String args[]){new Worker().makeObj();
}//end main()}//end class definition
class Worker{public void makeObj(){
Subclass obj = new Subclass();System.out.println(obj.getX() +
", " + obj.getY());}//end makeObj()
}// end classclass Superclass{
private int x = 1;public Superclass(){x = 5;
}//end constructorpublic int getX(){return x;
}//end getX()}//end Superclass
class Subclass extends Superclass{private int y = 2;public Subclass(){
super();y = 10;
}//end constructorpublic int getY(){return y;
}//end getY()}//end Subclass |
What output is produced by the program shown in Listing 2 ?
| Listing 2 . Listing for Question 2. |
|---|
public class Ap101{
public static void main(String args[]){new Worker().makeObj();
}//end main()}//end class definition
class Worker{public void makeObj(){
Subclass obj = new Subclass();System.out.println(obj.getX() +
", " + obj.getY());}//end makeObj()
}// end classclass Superclass{
private int x = 1;public Superclass(){x = 5;
}//end constructorpublic Superclass(int x){this.x = x;
}//end constructorpublic int getX(){return x;
}//end getX()}//end Superclass
class Subclass extends Superclass{private int y = 2;public Subclass(){
super(20);y = 10;
}//end constructorpublic int getY(){return y;
}//end getY()}//end Subclass |
What output is produced by the program shown in Listing 3 ?
| Listing 3 . Listing for Question 3. |
|---|
public class Ap102{
public static void main(String args[]){new Worker().finalStuff();
}//end main()}//end class definition
class Worker{public void finalStuff(){
final int x = 5;x = 10;
System.out.println(x);}//end finalStuff()
}// end class |
What output is produced by the program shown in Listing 4 ?
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