The code defines an interface A, class C, subclass B that implements A, and test class Test. When an instance of B is checked using instanceof with interfaces A and superclass C, both return true. This is because B implements A and extends C, so the instanceof operator returns true when checking if an object is a subtype of the given type.

1. Show the output of running the class Test in the following code lines and Explain why you get
this output.
interface A { void print(); }
class C {}
class B extends C implements A { public void print() { } }
class Test { public static void main(String[] args) {
B b = new B();
if (b instanceof A)
System.out.println("b is an instance of A");
if (b instanceof C)
System.out.println("b is an instance of C");
} }
Solution
OUTPUT
b is an instance of A
b is an instance of C
Explaination
instanceof keyword is a binary operator used to test if an object is a subtype of a given type .
b instanceof A is true because b is the object of class B which implements the interface A

2. Similarly
b instanceof C is also true because, b is the object of class B which is the subclass for class C.
According to the JAVA API
If the class or interface represented by this Class object is either the same as, or is a superclass
or superinterface of, the class or interface represented by the specified Class parameter, then
the above condition is true