Removing Key-Value Pairs in Maps

What is the signature of a Map method that removes a key-value pair from the Map?

a) void remove(K key) b) void delete(K key) c) V remove(K key) d) K delete(K key)

Answer:

The signature of the Map method that removes a key-value pair from the Map is 'V remove(K key)'.

When working with Maps in Java, it's essential to understand how to remove key-value pairs efficiently. The signature of the method that removes a key-value pair from a Map is crucial as it defines how the operation is performed.

The signature 'V remove(K key)' indicates that the method takes a key parameter and returns the corresponding value that was removed from the Map. This means that the key-value pair associated with the specified key is removed from the Map, and the method returns the value that was removed.

Here is an example of how the 'V remove(K key)' method can be used:

Map map = new HashMap<>();
map.put("apple", 1);
map.put("banana", 2);
int removedValue = map.remove("banana");
System.out.println(removedValue); // Output: 2

In this example, the key "banana" and its corresponding value 2 are removed from the Map. The removed value, which is 2 in this case, is then stored in the variable 'removedValue' and can be used as needed.