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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 Ap090{
public static void main(String args[]){new Worker().makeObj();
}//end main()}//end class definition
class Worker{public void makeObj(){
NewClass obj = NewClass();System.out.println(obj);
}//end makeObj()}// end class
class NewClass{public String toString(){
return "An Object";}//end toString()
}//end NewClass |
What output is produced by the program shown in Listing 2 ?
| Listing 2 . Listing for Question 2. |
|---|
public class Ap091{
public static void main(String args[]){new Worker().makeObj();
}//end main()}//end class definition
class Worker{public void makeObj(){
NewClass obj = new NewClass();System.out.println(obj);
}//end makeObj()}// end class
Class NewClass{public String toString(){
return "An Object";}//end toString()
}//end NewClass |
What output is produced by the program shown in Listing 3 ?
| Listing 3 . Listing for Question 3. |
|---|
public class Ap092{
public static void main(String args[]){new Worker().makeObj();
}//end main()}//end class definition
class Worker{public void makeObj(){
NewClass obj = new NewClass();System.out.println(obj);
}//end makeObj()}// end class
class NewClass{public String toString(){
return "An Object";}//end toString()
}//end NewClass |
What output is produced by the program shown in Listing 4 ?
| Listing 4 . Listing for Question 4. |
|---|
public class Ap093{
public static void main(String args[]){new Worker().makeObj();
}//end main()}//end class definition
class Worker{public void makeObj(){
NewClass obj = new NewClass();System.out.println(obj);
}//end makeObj()}// end class
class NewClass{private int x = 2;public NewClass(int x){
this.x = x;}//end constructorpublic String toString(){
return "Object containing " + x;}//end toString()
}//end NewClass |
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