What is the LinkedHashMap.get method in Java?

A LinkedHashMap is the same as HashMap, except the LinkedHashMap maintains the insertion order, whereas the HashMap doesn’t. Internally the LinkedHashMap uses the doubly-linked list to maintain the insertion order.

Read more about LinkedHashMap here.

The get method of LinkedHashMap will:

  • Return the Value associated with the passed key if there is a mapping present for the passed key.

  • Return null if there is no mapping present for the passed key.

Syntax

public V get(Object key)

Code

The code below demonstrates how to use the get method.

import java.util.LinkedHashMap;
class GetExample {
    public static void main(String[] args) {
        // create an LinkedHashMap
        LinkedHashMap<Integer, String> numbers = new LinkedHashMap<>();
        numbers.put(1, "One");
        numbers.put(2, "Two");
        System.out.println("The LinkedHashMap is - " + numbers);
        System.out.println("\nGetting value for key 1 :" + numbers.get(1));
        System.out.println("\nGetting value for key 5 :" + numbers.get(5));
    }
}

In the code above, we:

  • Create a LinkedHashMap object with the name numbers.

  • Add two entries to the numbers.

  • Call the get method for the key 1. This will return the value associated with the key 1. In our case one is returned.

  • Call the get method for the key 5. This will return null because there is no value associated for the key 5.

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