11. What is the output of this program?
    

    
    class N 
        {
            public int K;
            public int L;
            N() 
            {
                K = 5;
                L = 2;
    	}
        }    
        class M extends N
        {
            int p;
            M() 
            {
                super();
            } 
        }    
       public class inheritance_super_use 
        {
            public static void main(String args[])
            {
                M obj = new M();
                System.out.println(obj.K + " " + obj.L);     
            }
       }
    

1. 1. 5 1

   
   
   

   2. 1 5

   
   
   

   3. 5 2

   
   
   

   4. 2 5

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Keyword super is used to call constructor of class N by constructor of class M. Constructor of a initializes K & L to 5 & 2 respectively.

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12. What is not type of inheritance?

1. 1. Hierarchical inheritance

   
   
   

   2. Single inheritance

   
   
   

   3. Multiple inheritance

   
   
   

   4. Double inheritance

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Inheritance is way of acquiring attributes and methods of parent class. Java supports hierarchical inheritance directly.

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

1. 1. Multithreading

   
   
   

   2. Private methods

   
   
   

   3. Interfaces

   
   
   

   4. Protected methods

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Multiple inheritance in java is implemented using interfaces. Multiple interfaces can be implemented by a class.

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14. What is the outcome of below code box class?
    

    class Shape 
    {
    	public int area()
            {
    		return 0;
    	}
    }
    
    class Square extends Shape 
    {
    	public int area()
            {
    		return 5;
    	}
    }
    
    class Rectangle extends Shape 
    {
    	public int area()
            {
    		return 9;
    	}
    }
    
    public class box
    {
       public static void main(String[] args)
        {
    	 Shape obj = new Square();
       	 Shape obj0 = new Rectangle();
         	 obj = obj0;
    	 System.out.println(obj.area());
        }
    }
    

1. 1. Compilation Error

   
   
   

   2. Runtime Error

   
   
   

   3. Default value

   
   
   

   4. 9

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   The method of the child class object is accessed. When we reassign objects, the methods of the latest assigned object are accessed.

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

1. 1. Protected

   
   
   

   2. Public

   
   
   

   3. Static

   
   
   

   4. Private

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   By declaring variable private, the variable will not be available in inherited to subclass.

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