Introduction to Hashmaps

What type of data is stored in a Hashmap?

• Lists

• Key-value pairs

• Tuples

• Arrays

Which method is used to add a new key-value pair to a Hashmap in Java?

• add()

• put()

• remove()

• delete()

Hashmaps are _____.

• ordered

• unordered

____ have to be unique in a Hashmap.

• keys

• values

• both keys and values

• none of the mentioned

How can we get the total Set of keys in a Hashmap?

• no such method

• Set<String> keySet = hashMap.keySet();

• Set<String> keySet = hashMap.get();