QUESTION 10

QUESTION 10 
Click the Exhibit button. 
 
1. public class A { 
2.      
3.     private int counter = 0; 
4.      
5.     public static int getInstanceCount(){ 
6.         return counter; 
7.     } 
8.      
9.     public A(){ 
10.         counter++; 
11.     } 
12. } 
13. 
 
 
Given this code from Class B: 
 
A a1 = new A(); 
A a2 = new A(); 
A a3 = new A(); 
System.out.println(A.getInstanceCount()); 
 
What is the result? 
 
A. Compilation of class A fails. 
B. Line 28 prints the value 3 to System.out. 
C. Line 28 prints the value 1 to System.out. 
D. A runtime error occurs when line 25 executes. 
E. Compilation fails because of an error on line 28.
Solution : A


 

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plus imformation 

Main.java:6: non-static variable counter cannot be referenced from a static context

         return counter;

                ^ 

1 error