Java Collections Test – 1

1. Which of these packages contain all the collection classes?

2. Which of these methods deletes all the elements from invoking collection?

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

4. What is Collection in Java?

5. 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]);
        }
    }

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

 
    import java.util.*;
    class Bitset 
    {
        public static void main(String args[]) 
        {
            BitSet obj = new BitSet(5);
            for (int i = 0; i < 5; ++i)
                obj.set(i);
            obj.clear(2);
            System.out.print(obj);
        }
    }

7. Which of these classes is not part of Java's collection framework?