Quiz Discussion

Which of the following is used in implementing inheritance through class?

• 1]

  inherited

• 2]

  using

• 3]

  extends

• 4]

  implements

All classes in Java are inherited from which class?

• 1]

  java.lang.class

• 2]

  java.class.inherited

• 3]

  java.class.object

• 4]

  java.lang.object

What will be the output of the following Java program?

    class A 
    {
        int i;
    }    
    class B extends A 
    {
        int j;
        void display() 
        {
            super.i = j + 1;
            System.out.println(j + " " + i);
        }
    }    
    class inheritance 
    {
        public static void main(String args[])
        {
            B obj = new B();
            obj.i=1;
            obj.j=2;   
            obj.display();     
        }
   }

• 1]

  2 2

• 2]

  3 3

• 3]

  2 3

• 4]

  3 2

In order to restrict a variable of a class from inheriting to subclass, how variable should be declared?

• 1]

  Protected

• 2]

  Private

• 3]

  Public

• 4]

  Static

What will be the output of the following Java program?

    class A 
    {
        public int i;
        public int j;
        A() 
        {
            i = 1;
            j = 2;
	}
    }    
    class B extends A 
    {
        int a;
        B() 
        {
            super();
        } 
    }    
    class super_use 
    {
        public static void main(String args[])
        {
            B obj = new B();
            System.out.println(obj.i + " " + obj.j)     
        }
   }

• 1]

  1 2
   

• 2]

  2 1

• 3]

  Runtime Error

• 4]

  Compilation Error

Static members are not inherited to subclass.

• 1]

  True

• 2]

  False

What is not type of inheritance?

• 1]

  Single inheritance

• 2]

  Double inheritance

• 3]

  Hierarchical inheritance

• 4]

   Multiple inheritance

Does Java support multiple level inheritance?

• 1]

  True

• 2]

  False

Which of this keyword must be used to inherit a class?

• 1]

  super

• 2]

  this

• 3]

  extent

• 4]

  extends

 A class member declared protected becomes a member of subclass of which type?

• 1]

  public member

• 2]

  private member

• 3]

  protected member

• 4]

  static member