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Modify the value associated with a given key in Java HashMap
First, create a HashMap and add elements to it −
// Create a hash map
HashMap hm = new HashMap();
// Put elements to the map
hm.put("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Frames", new Integer(800));
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));Now, to modify the value associated with a given key, use the put() method. Here, we are modifying the value for the key “Frames” −
hm.put("Frames", "900");The following is an example to modify the value associated with a given key −
Example
import java.util.*;
public class Demo {
public static void main(String args[]) {
// Create a hash map
HashMap hm = new HashMap();
// Put elements to the map
hm.put("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Frames", new Integer(800));
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));
// Get a set of the entries
Set set = hm.entrySet();
System.out.println("Elements in HashMap...");
System.out.println(set);
hm.put("Frames", "900");
System.out.println("
Updated HashMap Elements...");
System.out.println(hm);
}
}Output
Elements in HashMap...
[Frames=800, Belt=600, Wallet=700, Bag=1100, Sunglasses=2000]
Updated HashMap Elements...
{Frames=900, Belt=600, Wallet=700, Bag=1100, Sunglasses=2000}
Updated on: 30-Jul-2019
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