Set 23

Multiple Choice Question

QID: 
192

Which of the following statements are true?

Select 2 options

A. The extends keyword is used to specify inheritance.
B. subclass of a non-abstract class cannot be declared abstract.
C. subclass of an abstract class can be declared abstract.
D. subclass of a final class cannot be abstract.
E. A class, in which all the members are declared private, cannot be declared public.

Multiple Choice Question

QID: 
191

What should be inserted in the code given below at line marked //10:

class MyClass{
}
class MyComparable implements Comparable<MyClass>{
public int compareTo( *INSERT CODE HERE* x ){ //10
return 0;
}
}

Select 1 option

A. Object
B. MyClass
C. Object<MyClass>
D. Comparable<MyClass>
E. Comparable

Multiple Choice Question

QID: 
190

Consider this code:

interface X1{ }
interface X2{ }
class A { }
class B extends A implements X1{ }
class C extends B implements X2{
D d = new D();
}
class D { }

Which of the following statements are true?

Select 3 options

A. D is-a B.
B. B has-a D.
C. C is-a A
D. C is-a X1
E. C is-a X2

Multiple Choice Question

QID: 
189

Which of these statements about interfaces are true?

Select 3 options

A. Interfaces permit multiple implementation inheritance.
B. Unlike a class, an interface can extend from multiple interfaces.
C. Members of an interface are never static.
D. Members of an interface may be static.
E. Interfaces cannot be final.

Multiple Choice Question

QID: 
188

Given:

interface Worker {   
void  performWork(); 
} class FastWorker  implements Worker {  
 public void  performWork(){ } 
} 

You are creating a class that follows "program to an interface" principle. Which of the following line of code will you most likely be using?

Select 1 option 

A. public FastWorker getWorker(){ return new Worker(); } 
B. public FastWorker getWorker(){ return new FastWorker(); } 
C. public Worker getWorker(){ return new FastWorker(); } 
D. public Worker getWorker(){ return new Worker(); } 

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