Practice Exam

Question 1 Given the following definition of the Demo class and the DerivedDemo class: 
1. public class Demo extends Object {
2.   String Title ;
3.   public Demo( String t ){
4.      Title = t ;
5.   }
6.   public void showTitle() {
7.    System.out.println("Title is " + Title) ;
8.   }
9. }
10. class DerivedDemo extends Demo {
11.    public void setTitle( String  tt )
         { Title = tt ; }
12. }

What happens if you try to compile this code, create a DerivedDemo object, and immediately call the showTitle method of that object?

  • A. The message “Title is null” is written to standard output.

  • B. The compiler complains about the DerivedDemo class.

  • C. A NullPointerException is thrown in line 7.

Question 2 Which of the following class declarations are not correct ...

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