Java HashMap get()

 import java.util.HashMap; class Main { public static void main(String[] args) { // create an HashMap HashMap<Integer, String> numbers = new HashMap<>(); numbers.put(1, "Java"); numbers.put(2, "Python"); numbers.put(3, "JavaScript"); 
 // get the value with key 1 String value = numbers.get(1); 
 System.out.println("HashMap Value with Key 1: " + value); } } // Output: HashMap Value with Key 1: Java

Syntax of HashMap get()

The syntax of the get() method is:

 hashmap.get(Object key)

Here, hashmap is an object of the HashMap class.

get() Parameters

The get() method takes a single parameter.

• key - key whose mapped value is to be returned

get() Return Value

• returns the value to which the specified key is associated

Note: The method returns null, if either the specified key is mapped to a null value or the key is not present on the hashmap.

Example 1: Get String Value Using Integer Key

 import java.util.HashMap; class Main { public static void main(String[] args) { // create an HashMap HashMap<Integer, String> numbers = new HashMap<>(); // insert entries to the HashMap numbers.put(1, "Java"); numbers.put(2, "Python"); numbers.put(3, "JavaScript"); System.out.println("HashMap: " + numbers); // get the value 
 String value = numbers.get(3); System.out.println("The key 3 maps to the value: " + value); 
 } }

Output

 HashMap: {1=Java, 2=Python, 3=JavaScript} The key 3 maps to the value: JavaScript

In the above example, we have created a hashmap named numbers. The get() method is used to access the value Java to which the key 1 is associated with.

Note: We can use the HashMap containsKey() method to check if a particular key is present in the hashmap.

Example 2: Get Integer Value Using String Key

 import java.util.HashMap; class Main { public static void main(String[] args) { // create an HashMap HashMap<String, Integer> primeNumbers = new HashMap<>(); // insert entries to the HashMap primeNumbers.put("Two", 2); primeNumbers.put("Three", 3); primeNumbers.put("Five", 5); System.out.println("HashMap: " + primeNumbers); // get the value 
 int value = primeNumbers.get("Three"); 
 System.out.println("The key Three maps to the value: " + value); } }

Output

 HashMap: {Five=5, Two=2, Three=3} The key Three maps to the value: 3

In the above example, we have used the get() method to get the value 3 using the key Three.

Also Read:

• Java ArrayList get()