Look at the following code: Line 1 public class ClassA
Line 2 {
Line 3 public ClassA() {}
Line 4 public void method1(int a){}
Line 5 }
Line 6 public class ClassB extends ClassA
Line 7 {
Line 8 public ClassB(){}
Line 9 public void method1(){}
Line 10 }
Line 11 public class ClassC extends ClassB
Line 12 {
Line 13 public ClassC(){}
Line 14 public void method1(){}
Line 15 }
Which method1 will be executed when the following statements are executed?
ClassA item1 = new ClassB();
Item1.method1();
A) Line 4
B) Line 9
C) Line 14
D) This is an error and will cause the program to crash.

Question

Quizplus · Accepted Answer

When we create an instance of ClassB using `new ClassB()`, it inherits the method1 from ClassA, but it also overrides it with its own implementation. Similarly, when we create an instance of ClassC using `new ClassC()`, it inherits the method1 from ClassB, but it again overrides it with its own implementation. Therefore, when we create an instance of ClassB and call method1, it will call the implementation of method1 in ClassB (Line 9). Similarly, when we create an instance of ClassC and call method1, it will call the implementation of method1 in ClassC (Line 14). However, if we create an instance of ClassA and call method1, it will call the implementation of method1 in ClassA (Line 4).

Look at the Following Code: Line 1 Public Class ClassA