Java Collections Test – 2

1. Which of these is a Basic interface that all other interface inherits?

2. Which of these is static variable defined in Collections?

3. Which of these interface handle sequences?

4. 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.sort(array);
            for (int i = 0; i < 5; ++i)
            	System.out.print(array[i]);;
        }
    }

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

 
    import java.util.*;
    class Collection_Algos 
    {
        public static void main(String args[]) 
        {
            LinkedList list = new LinkedList();
            list.add(new Integer(2));
            list.add(new Integer(8));
            list.add(new Integer(5));
            list.add(new Integer(1));
            Iterator i = list.iterator();
            Collections.reverse(list);
	    Collections.sort(list);
            while(i.hasNext())
	        System.out.print(i.next() + " ");
        }
    }

6. Which of this interface must contain a unique element?

7. Which of these interface declares core method that all collections will have?

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

 
    import java.util.*;
    class Collection_Algos 
    {
        public static void main(String args[]) 
        {
            LinkedList list = new LinkedList();
            list.add(new Integer(2));
            list.add(new Integer(8));
            list.add(new Integer(5));
            list.add(new Integer(1));
            Iterator i = list.iterator();
            Collections.reverse(list);
	    Collections.shuffle(list);
            while(i.hasNext())
	        System.out.print(i.next() + " ");
        }
    }