Java Programming Mock Test 6

1. Which of these method of HashSet class is used to add elements to its object?

2. Which of these method Map class is used to obtain an element in the map having specified key?

3. What will be the output of the following Java program?

 
    import java.lang.reflect.*;
    class Additional_packages
    {	 
         public static void main(String args[])
         {
	     try
             {
	         Class c = Class.forName("java.awt.Dimension");
		 Method methods[] = c.getMethods();
		 for (int i = 0; i < methods.length; i++)
		     System.out.println(methods[i]);
	     }
	     catch (Exception e)
             {
             System.out.print("Exception");
             }
        }
    }

4. What is the difference between TreeSet and SortedSet?

5. Which of this interface is not a part of Java's collection framework?

6. Which of these class object uses the key to store value?

7. What will be the output of the following Java code?

 
    import java.util.*;
    class Bitset
    {
        public static void main(String args[])
        {
            BitSet obj1 = new BitSet(5);
            BitSet obj2 = new BitSet(10);
            for (int i = 0; i < 5; ++i)
                obj1.set(i);
            for (int i = 3; i < 13; ++i)
                obj2.set(i);
            obj1.and(obj2);
            System.out.print(obj1);
        }
    }

8. What will be the output of the following Java program?

 
    import java.util.*;
    class Array 
    {
        public static void main(String args[]) 
        {
            int array[] = new int [5];
            for (int i = 5; i > 0; i--)
                array[5-i] = i;
            Arrays.fill(array, 1, 4, 8);
            for (int i = 0; i < 5 ; i++)
                System.out.print(array[i]);
        }
    }

9. Which of these methods is used to retrieve elements in BitSet object at specific location?

10. What is the worst case complexity of accessing an element in ArrayList?