ChangeElementsOfHashMap - Java

This tutorial will introduce how to change elements of HashMap in Java.

Introduction

HashMap is a popular data structure in Java that allows storing key-value pairs. It provides an efficient way to access, insert, and delete elements. However, sometimes we need to change the value associated with a particular key in a HashMap. In this tutorial, we will show you how to do that.

Change Elements Of HashMap

To change the value associated with a particular key in a HashMap, you can use the put method of the HashMap class. The put method inserts the specified value into the map and associates it with the specified key. If the key already exists in the map, then the old value is replaced with the new value. Here's an example:

HashMap<String, Integer> map = new HashMap<>();

map.put("key1", 100);
map.put("key2", 200);

// Change the value associated with "key1"
map.put("key1", 500);

System.out.println(map);

This will output:

{key1=500, key2=200}

As you can see, the value associated with "key1" has been changed from 100 to 500 using the put method.

Conclusion

Changing the value associated with a key in a HashMap is a simple task in Java. You can use the put method to insert or modify the value associated with a key. We hope this tutorial has been helpful to you!