To remove all values from HashMap, use the clear() method.
First, let us create a HashMap.
HashMap hm = new HashMap();
Add some elements to the HashMap
hm.put("Wallet", new Integer(700)); hm.put("Belt", new Integer(600)); hm.put("Backpack", new Integer(1200));
Now, remove all the elements
hm.clear();
The following is an example to remove all values from HashMap.
import java.util.*; public class Demo { public static void main(String args[]) { // Create hash map HashMap hm = new HashMap(); hm.put("Wallet", new Integer(700)); hm.put("Belt", new Integer(600)); hm.put("Backpack", new Integer(1200)); System.out.println("Map = "+hm); hm.clear(); System.out.println("Map after removing all the elements (blank)= "+hm); } }
The following is the output
Map = {Backpack=1200, Belt=600, Wallet=700} Map after removing all the elements (blank)= {}