Given the following code:

class C1 {}

class C2 extends C1 { }

class C3 extends C2 { }

class C4 extends C1 {}

C1 c1 = new C1 ();

C2 c2 = new C2 ();

C3 c3 = new C3 ();

C4 c4 = new C4 ();

Which of the following expressions evaluates to false?

c4 instanceof C2

c2 instanceof C1

c3 instanceof C1

c1 instanceof C1

Question

Computers and Technology

Ayla Werner

17 November, 09:59

Given the following code:

class C1 {}

class C2 extends C1 { }

class C3 extends C2 { }

class C4 extends C1 {}

C1 c1 = new C1 ();

C2 c2 = new C2 ();

C3 c3 = new C3 ();

C4 c4 = new C4 ();

Which of the following expressions evaluates to false?

c4 instanceof C2

c2 instanceof C1

c3 instanceof C1

c1 instanceof C1

+3

Answers (1)

Know the Answer?

Katie Oneal · Answer 1

c4 instanceof C2 evaluates to false.

Explanation:

As C2 extends C1 so c2 instanceof C1 evaluates to true.

As C3 extends C2 which then extends C1 so c3 instanceof C1 evaluates to true.

As the object c1 is an instance of C1 class so c1 instanceof C1.

Therefore only c4 instanceof C2 evaluates to false.

Given the following code:class C1 {}class C2 extends C1 { }class C3 extends C2 { }class C4 extends C1 {}C1 c1 = new C1 ();C2 c2 = new C2 ();C3 c3 = new C3 ();C4 c4 = new C4 ();Which of the following expressions evaluates to false?c4 instanceof C2c2 instanceof C1c3 instanceof C1c1 instanceof C1