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Quiz Discussion

What would be the result if a class extends two interfaces and both have a method with same name and signature? Lets assume that the class is not implementing that method.

Course Name: Java

  • 1]

    Runtime error
  • 2]

    Compile time error
  • 3]

    Code runs successfully
  • 4]

    First called method is executed successfully
Solution
No Solution Present Yet

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#Quiz
1
Discuss

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

  • 1]

    inherited
  • 2]

    using
  • 3]

    extends
  • 4]

    implements
Solution
10
Discuss

Which of these is correct way of inheriting class A by class B?

  • 1]

    class B + class A {}
  • 2]

    class B inherits class A {}
  • 3]

    class B extends A {}
  • 4]

    class B extends class A {}
Solution
2
Discuss

Using which of the following, multiple inheritance in Java can be implemented?

  • 1]

    Interfaces
  • 2]

    Multithreading
  • 3]

    Protected methods
  • 4]

    Private methods
Solution
3
Discuss

Static members are not inherited to subclass.

  • 1]

    True
  • 2]

    False
Solution
4
Discuss

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

  • 1]

    super
  • 2]

    this
  • 3]

    extent
  • 4]

    extends
Solution
5
Discuss

If super class and subclass have same variable name, which keyword should be used to use super class?

  • 1]

    super
  • 2]

    this
  • 3]

    upper
  • 4]

    classname
Solution
6
Discuss

What will be the output of the following Java program?

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

 

  • 1]

    0
  • 2]

    1
  • 3]

    2
  • 4]

    Compilation Error
Solution
7
Discuss

 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
Solution
8
Discuss

Which of the following is used for implementing inheritance through an interface?

  • 1]

    inherited
  • 2]

    using
  • 3]

    extends
  • 4]

    implements
Solution
9
Discuss

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
Solution
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