Overriding and Overloading MCQs with Answers 2027

Q41

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();
      }
}

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Q42

Open question

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);
      }
}

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Q43

Open question

Which of these keywords can be used to prevent Method overriding?

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Q44

Open question

What will be the output of the following Java 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();     
     }
}

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Q45

Open question

What will be the output of the following Java 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]);
  }
}

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Q46

Open question

What will be the output of the following Java code?

class overload 
{
    int x;
int y;
    void add(int a)
    {
        x =  a + 1;
    }
    void add(int a , int b)
    {
        x =  a + 2;
    }        
}    
class Overload_methods 
{
    public static void main(String args[])
    {
        overload obj = new overload();   
        int a = 0;
        obj.add(6, 7);
        System.out.println(obj.x);     
    }
}

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Q47

Open question

What is the process of defining a method in a subclass having same name & type signature as a method in its superclass?

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Q48

Open question

What will be the output of the following Java code?

class A
{
 public void m1 (int i,float f)
 {
  System.out.println(" int float method");
 }
 
 public void m1(float f,int i);
  {
  System.out.println("float int method");
  }
 
  public static void main(String[]args)
  {
    A a=new A();
        a.m1(20,20);
  }
}

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Q49

Open question

Which of these is correct way of calling a constructor having no parameters, of superclass A by subclass B?

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Q50

Open question

What is the process of defining two or more methods within same class that have same name but different parameters declaration?

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Q51

Open question

What will be the output of the following Java code?

class test 
{
    int a;
    int b;
    test(int i, int j) 
    {
        a = i;
        b = j;
    }
    void meth(test o) 
    {
        o.a *= 2;
        O.b /= 2;
    }          
}    
class Output 
{
    public static void main(String args[])
    {
        test obj = new test(10 , 20);
        obj.meth(obj);
        System.out.println(obj.a + " " + obj.b);        
    } 
}

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Q52

Open question

Which of these is correct about passing an argument by call-by-value process?

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Q53

Open question

What will be the output of the following Java code?

class overload 
{
    int x;
int y;
    void add(int a) 
    {
        x =  a + 1;
    }
    void add(int a, int b)
    {
        x =  a + 2;
    }        
}    
class Overload_methods 
{
    public static void main(String args[])
    {
        overload obj = new overload();   
        int a = 0;
        obj.add(6);
        System.out.println(obj.x);     
    }
}

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Q54

Open question

What will be the output of the following Java code?

class overload 
{
     int x;
double y;
     void add(int a , int b) 
     {
         x = a + b;
     }
     void add(double c , double d)
     {
         y = c + d;
     }
     overload() 
     {
         this.x = 0;
         this.y = 0;
     }        
 }    
 class Overload_methods 
 {
     public static void main(String args[])
     {
         overload obj = new overload();   
         int a = 2;
         double b = 3.2;
         obj.add(a, a);
         obj.add(b, b);
         System.out.println(obj.x + " " + obj.y);     
     }
}

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Q55

Open question

Which of these is supported by method overriding in Java?

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Q56

Open question

What is the process of defining a method in terms of itself, that is a method that calls itself?

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Q57

Open question

Which of this keyword can be used in a subclass to call the constructor of superclass?

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Q58

Open question

What will be the output of the following Java program?

class Abc
{
    public static void main(String[]args)
    {
        String[] elements = { "for", "tea", "too" };
        String first = (elements.length > 0) ? elements[0]: null;
    }
}

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Q59

Open question

Which of these can be overloaded?

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Q60

Open question

At line number 2 in the following code, choose 3 valid data-type attributes/qualifiers among "final, static, native, public, private, abstract, protected"

public interface Status
   {
        /* insert qualifier here */ int MY_VALUE = 10;
   }

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