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Overriding and Overloading in Java

⛪ Programming Language > Java Programming Language

Evaluate your knowledge of Java overriding and overloading with these multiple choice questions. Learn about the difference between the two concepts and how to use them to create more flexible and efficient Java programs. Take the quiz now! ➲ Overriding and Overloading in Java - Quiz

Q 1: What is the output for the below code ?

class A{
      private void printName(){
            System.out.println("Value-A");
      }
}
class B extends A{
      public void printName(){
            System.out.println("Name-B");
      }
}
public class Test{
      public static void main (String[] args){
            B b = new B();
            b.printName();
      }
}

A Value-A
B Name-B
C Value-A Name-B
D Compilation fails - private methods can't be override

Q 2: What is the output for the below code ?

class A{
      public A(){
            System.out.println("A");
      }
      public A(int i){
            this();
            System.out.println(i);
      }
}
class B extends A{
      public B(){
            System.out.println("B");
      }
      public B(int i){
            this();
            System.out.println(i+3);
      }
}
public class Test{
      public static void main (String[] args){
            new B(5);
      }
}

A A B 8
B A 5 B 8
C A B 5
D B 8 A 5

Q 3: What will be the output?

class A{
	static void method(){
		System.out.println("Class A method");
	}
}
class B extends A{
	static void method(){
		System.out.println("Class B method");
	}
}
public class Test{
	public static void main(String args[]){
		A a = new B();
		a.method();
	}
}

A Class A method
B Class B method
C Compilation Error
D Runtime Error

Q 4: ____________ method cannot be overridden.

A super
B static
C final
D private

Q 5: What will be the output?

class A{
      int i = 10;
      public void printValue(){
            System.out.print("Value-A");
      }
}

class B extends A{
      int i = 12;
      public void printValue(){
            System.out.print("Value-B");
      }
}

public class Test{
      public static void main(String args[]){
            A a = new B();
            a.printValue();
            System.out.print(a.i);
      }
}

A Value-B 11
B Value-B 10
C Value-A 10
D Value-A 11

Q 6: What is the output for the below code?

public class Test{
      public static void printValue(int i, int j, int k){
            System.out.println("int");
      }

      public static void printValue(byte...b){
            System.out.println("long");
      }

      public static void main(String... args){
            byte b = 9;
            printValue(b,b,b);
      }
}

A long
B int
C Compilation fails
D Compilation clean but throws RuntimeException

Q 7: Determine output:

class A{
      public void printValue(){
            System.out.println("Value-A");
      }
}
class B extends A{
      public void printNameB(){
            System.out.println("Name-B");
      }
}
class C extends A{
      public void printNameC(){
            System.out.println("Name-C");
      }
}

1. public class Test{
2.       public static void main (String[] args){
3.             B b = new B();
4.             C c = new C();
5.             newPrint(b);
6.             newPrint(c);
7.       }
8.       public static void newPrint(A a){
9.             a.printValue();
10.      }
11. }

A Value-A Name-B
B Value-A Value-A
C Value-A Name-C
D Name-B Name-C

Q 8: What is output of the program?

class Test{
        public void display(int x, double y){
                System.out.println(x+y);
        } 
        public double display(int p, double q){
                return (p+q);
        }
        public static void main(String args[]){
                Test test = new Test();
                test.display(4, 5.0);
                System.out.println(test.display(4, 5.0));
        }
}

A 9.0 9.0
B 9 9
C Compilation Error
D None of these

Q 9: what is the result of the following piece of code:

public class Person{
        public void talk(){
                System.out.print("I am a Person");
        }
}

public class Student extends Person{
        public void talk(){
                System.out.print("I am a Student");
        }
}

public class Test{
        public static void main(String args[]){
                Person p = new Student();
                p.talk();
        }
}

A I am a Person
B I am a Student
C I am a Person I am a Student
D I am a Student I am a Person

Q 10: What will be the output?

interface A{
	public void method1();
}
class One implements A{
	public void method1(){
		System.out.println("Class One method1");
	}
}
class Two extends One{
	public void method1(){
		System.out.println("Class Two method1");
	}
}
public class Test extends Two{
	public static void main(String[] args){
		A a = new Two();
		a.method1();
	}
}

A Class One method1
B Class Two method1
C Nothing will be printed
D Compilation Error

Q 11: What will be the output of the following program code?


class Rectangle{
      public int area(int length, int width){
            return  length*width;
      }
}
class Square extends Rectangle{
      public int area(long length, long width){
            return  (int) Math.pow(length, 2);
      }
}
public class Test{
      public static void main(String args[]){
            Square r = new Square();
            System.out.println(r.area(5 , 4));
      }
}

A Will not compile.
B Will compile and run printing out 20
C Runtime error
D Will compile and run printing out 25

Q 12: What will be printed after executing following program code?

class Base{
	int value = 0;
        Base(){
        	addValue();
        }
        void addValue(){
        	value += 10;
        }
        int getValue(){
        	return value;
        }
}
class Derived extends Base{
	Derived(){
		addValue();
	}
	void addValue(){
		value +=  20;
	}
}
public class Test{
	public static void main(String[] args){
		Base b = new Derived();
		System.out.pr

A 10
B 20
C 30
D 40