Introduction to Sets

State true or false. Multiple items with the same value can be stored as multiple items in a Java Set.

• True

• False

‘Set’ in Java is a/an:

• Class

• Interface

• Loop

• Conditional

The Set interface in Java is implemented by which Class to create and use sets?

• HashSet class

• ArrayList class

• List class

• none of the mentioned

State true or false. The correct way of using a for loop for iterating through the items in a Set is:

for(int item : hash_Set)

   System.out.print(item + " ");

• True

• False

What will be the output of the following code?

       Set<Integer> hash_Set = new HashSet<Integer>();

       // Adding elements to the Set

       hash_Set.add(1);

       hash_Set.add(2);

       hash_Set.add(3);

 

       System.out.println(hash_Set(0));

• 1

• 0

• 2

• Error, as a Set cannot be accessed using index