Set 27

Multiple Choice Question

QID: 
390

Consider the following class hierarchy:
A|B
1, B2
|C
1, C2

(B1 and B2 are subclasses of A and C1, C2 are subclasses of B1) Which of the following statements are correct? Assume that objectOfA, objectOfC1, etc. are objects of classes A and C1 respectively.

Select 1 option

A. objectOfC2 instanceof B2 will return true.
B. objectOfC1 instanceof B1 will return true.
C. objectOfA instanceof B1 will return true.
D. C1 c1 = objectOfA; is a valid statement.
E. B1 b1 = objectOfB2; is a valid statement.

Multiple Choice Question

QID: 
389

Given:

interface I { }
class A implements I{
    public String toString(){ return "in a"; }
}
class B extends A{
    public String toString(){ return "in b"; }
}
public class TestClass {
    public static void main(String[] args) {
        B b = new B();
        A a = b;
        I i = a;
        
        System.out.println(i);
        System.out.println((B)a);
        System.out.println(b);
        
    }
}

What will be printed when the above code is compiled and run?

Select 1 option

A. in i
in a
in b
B. I
A
in b
C. in a
in a
in b
D. in a
in b
in b
E. in b
in b
in b

Multiple Choice Question

QID: 
388

What will be the output of compiling and running the following program:

class TestClass implements I1, I2{
public void m1() { System.out.println("Hello"); }
public static void main(String[] args){
TestClass tc = new TestClass();
( (I1) tc).m1();
}  }interface I1{
int VALUE = 1;
void m1();
}interface I2{
int VALUE = 2;
void m1();
}

Select 1 option

A. It will print Hello.
B. There is no way to access any VALUE in TestClass.
C. The code will work fine only if VALUE is removed from one of the interfaces.
D. It will not compile.
E. None of the above.

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