Computers And Technology High School

Consider the following class definitions.
public class A
{
private int al;
public void methodA()
{
methodB(); // Statement I
}
}
public class B extends A
{
public void methodB()
{
methodaA(); // Statement II
al = 0; // Statement III
}
}
Which of the labeled statements in the methods shown above will cause a compile-time error?
I only
I only
A
III only
III only
B
I and II
I and II
C
I and III
I and III
D
II and III
II and III
E

Answers

Answer 1

The statement which will cause a compile-time error in the given class definitions is "II only". Hence, option A is correct.Explanation:The given classes are used to test the hierarchical inheritance concept in Java programming language.

The class B is a subclass of class A and it inherits the methods of class A including methodA().The methodA() in class A calls the methodB() of the same class A. Whereas, the methodB() of class B calls the methodA() of class A.The methodB() of class B also contains two other statements labeled as statement II and statement III. In statement II, it tries to call the methodA() again, which may cause infinite recursion.

Whereas, in statement III, it initializes the value of a private integer field "al" to 0.However, the given statement II in the methodB() of class B, "methodaA()" is not spelled correctly, it should be "methodA()". Hence, the statement II will cause a compile-time error. Thus, option A is correct.

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