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 method will be executed as a result of the following statements?
ClassB item1 = new ClassA();
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

The code will cause a compile-time error because you cannot assign an instance of ClassA to a reference of ClassB. The assignment `ClassB item1 = new ClassA();` is invalid due to incompatible types.

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