Map put() Method Examples
Let’s see some examples of how to use the map put() method:
Example 1
How to insert/add elements in a map using the map put() method:
Java
// Java code to show the implementation of // put method in Map interface import java.util.*; public class GfG { // Driver code public static void main(String[] args) { // Initializing a Map of type HashMap Map<Integer, String> map = new HashMap<>(); map.put( 1 , "One" ); map.put( 3 , "Three" ); map.put( 5 , "Five" ); map.put( 7 , "Seven" ); map.put( 9 , "Nine" ); System.out.println(map); } } |
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine}
Example 2
Below is the code to show the implementation of put().
Java
// Java code to show the implementation of // put method in Map interface import java.util.*; public class GfG { // Driver code public static void main(String[] args) { // Initializing a Map of type HashMap Map<String, String> map = new HashMap<>(); map.put( "1" , "One" ); map.put( "3" , "Three" ); map.put( "5" , "Five" ); map.put( "7" , "Seven" ); map.put( "9" , "Nine" ); System.out.println(map); } } |
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine}
Read More Map Methods
Whether you are a beginner starting Java programming or an experienced looking to brush up on your Java skills, this tutorial will provide you with a deep understanding of the map put function and its uses in Java.
The map put method in Java is a fundamental function for map manipulation. With this guide, you can easily add new key-value pairs using the map put function.
Map put() Method in Java with Examples
The Map put() method associates the specified value with the specified key in the map. The map put() method is used to insert new key-value pairs inside a map in Java.
If the map already contains the mapping for the specified key, the old value is replaced by the new specified value.
Example:
Java
// Java Program to demonstrate the // Usage of put() method in Map interface import java.util.HashMap; import java.util.Map; // Driver Class public class MapPutExample { // Main Function public static void main(String[] args) { // Create a HashMap instance Map<String, Integer> map = new HashMap<>(); // Add key-value pairs to the map map.put( "One" , 1 ); map.put( "Two" , 2 ); // Display the map after adding elements System.out.println( "Map after adding elements: " + map); // Replace the value associated with key // 'Two' and store the previous value Integer oldValue = map.put( "Two" , 22 ); // Display the previous value associated with key 'Two' System.out.println( "Previous value for key 'Two': " + oldValue); // Display the map after updating the value for key 'Two' System.out.println( "Map after updating 'Two': " + map); } } |
Output:
Map after adding elements: {One=1, Two=2}
Previous value for key 'Two': 2
Map after updating 'Two': {One=1, Two=22}