Unit 4 Maps - Java - CSIII

What is a map in java?

• A map in Java is a data structure which stores data in key-value pairs
• A map in Java is a function that applies to all elements in a list
• A map in Java is a method for converting strings to integers
• A map in Java is a type of loop structure

Which of the following is not a type of Map in Java?

• HashMap

• LinkedHashMap

• TreeMap

• MapList

What will happen if you try to insert the duplicate key into a Java Map?

• It will throw an exception

• It will replace the old value with the new one

• It will ignore the new value

• Both key and value will be duplicated

What does the put() function do in a Java Map?

• It adds a new key-value pair to the map

• It removes a key-value pair from the map

• It checks if a key exists in the map

• It clears all entries from the map

What method is used to check if a Map contains a specific key?

• containsKey()

• hasKey()

• isKey()

• keyExists()

What is the default initial capacity of a HashMap in Java?

• 10

• 16

• 32

• 64

What method is used to retrieve a value from a Map using a key?

• getValue()

• fetchValue()

• get()

• retrieveValue()

What is the method to remove all mappings from a map in Java?

• clear()

• removeAll()

• deleteAll()

• empty()

What is the method to check if a map contains a specific key in Java?

• containsKey(Object key)

• hasKey(Object key)

• includesKey(Object key)

• contains(Object key)

What does the get() function do in a Java Map?

• It retrieves the value mapped to a specific key

• It adds a new key-value pair to the map

• It removes a key-value pair from the map

• It checks if a key exists in the map