Java Inheritance Mcqs
Our collections of Multiple choice questions and answers focuses on study of Java Inheritance. These questions are chosen from a collection of most authoritative and best reference books on Java. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams and various tests and job interviews. One should practice our Mcqs to assimilate Java Inheritance topic comprehensively.
Java Programming Mcqs
Computer MCQS
Sciences MCQS
17.
Which of the following is used for implementing inheritance through an interface?
18.
Which of the following is used for implementing inheritance through class?
19.
What would be the result if a class extends two interfaces and both have a method with same name and signature?
20.
Which of this keyword can be used in a subclass to call the constructor of superclass?
21.
What is the process of defining a method in a subclass having same name & type signature as a method in its superclass?
22.
Which of these keywords can be used to prevent Method overriding?
23.
Which of these is correct way of calling a constructor having no parameters, of superclass A by subclass B?
25.
Which of these is supported by method overriding in Java?
26.
What is the output of this program?
class Alligator
{
public static void main(String[] args)
{
int []x[] = {{1,2}, {3,4,5}, {6,7,8,9}};
int [][]y = x;
System.out.println(y[2][1]);
}
}
class Alligator
{
public static void main(String[] args)
{
int []x[] = {{1,2}, {3,4,5}, {6,7,8,9}};
int [][]y = x;
System.out.println(y[2][1]);
}
}
27.
What is the output of this program?
final class A
{
int i;
}
class B extends A
{
int j;
System.out.println(j + " " + i);
}
class inheritance
{
public static void main(String args[])
{
B obj = new B();
obj.display();
}
}
final class A
{
int i;
}
class B extends A
{
int j;
System.out.println(j + " " + i);
}
class inheritance
{
public static void main(String args[])
{
B obj = new B();
obj.display();
}
}
28.
What is the output of this program?
class Abc
{
public static void main(String[]args)
{
String[] elements = { "for", "tea", "too" };
String first = (elements.length > 0) ? elements[0]: null;
}
}
class Abc
{
public static void main(String[]args)
{
String[] elements = { "for", "tea", "too" };
String first = (elements.length > 0) ? elements[0]: null;
}
}
29.
What is the output of this program?
class A
{
int i;
public void display()
{
System.out.println(i);
}
}
class B extends A
{
int j;
public void display()
{
System.out.println(j);
}
}
class Dynamic_dispatch
{
public static void main(String args[])
{
B obj2 = new B();
obj2.i = 1;
obj2.j = 2;
A r;
r = obj2;
r.display();
}
}
class A
{
int i;
public void display()
{
System.out.println(i);
}
}
class B extends A
{
int j;
public void display()
{
System.out.println(j);
}
}
class Dynamic_dispatch
{
public static void main(String args[])
{
B obj2 = new B();
obj2.i = 1;
obj2.j = 2;
A r;
r = obj2;
r.display();
}
}
30.
What is the output of this program?
class Output
{
public static void main(String args[])
{
Object obj = new Object();
System.out.print(obj.getclass());
}
}
class Output
{
public static void main(String args[])
{
Object obj = new Object();
System.out.print(obj.getclass());
}
}
31.
What is the output of this program?
class A
{
int i;
int j;
A()
{
i = 1;
j = 2;
}
}
class Output
{
public static void main(String args[])
{
A obj1 = new A();
System.out.print(obj1.toString());
}
}
class A
{
int i;
int j;
A()
{
i = 1;
j = 2;
}
}
class Output
{
public static void main(String args[])
{
A obj1 = new A();
System.out.print(obj1.toString());
}
}