Java Programming for Complete Beginners - Java 16 - Step 22 - Map Interface - an Introduction - Key and Value

What is the primary purpose of a Map interface in Java?

• To store a collection of unique elements

• To store key-value pairs

• To provide thread-safe operations

• To sort elements in natural order

Which of the following methods is used to check if a Map is empty?

• clear()

• remove()

• containsKey()

• isEmpty()

How can you retrieve a value associated with a specific key in a Map?

• Using the get() method

• Using the put() method

• Using the size() method

• Using the clear() method

Which method would you use to remove a specific key-value pair from a Map?

• discard()

• remove()

• erase()

• delete()

Which of the following is NOT an implementation of the Map interface?

• HashMap

• ArrayList

• LinkedHashMap

• TreeMap