Remove all elements in Java IdentityHashMap

Use the clear() method to remove all the elements from IdentityHashMap in Java.

Create a IdentityHashMap and add some elements

Map<String, Integer> m = newIdentityHashMap<String, Integer>(); m.put("1", 100); m.put("2", 200); m.put("3", 300); m.put("4", 150); m.put("5", 110); m.put("6", 50); m.put("7", 90); m.put("8", 250); m.put("9", 350); m.put("10", 450);

Now, let us remove all the element

m.clear();

The following is an example to remove all elements in IdentityHashMap in Java

Example

 Live Demo

import java.util.*; public class Demo {    public static void main(String[] args) {       Map<String, Integer> m = newIdentityHashMap<String, Integer>();       m.put("1", 100);       m.put("2", 200);       m.put("3", 300);       m.put("4", 150);       m.put("5", 110);       m.put("6", 50);       m.put("7", 90);       m.put("8", 250);       m.put("9", 350);       m.put("10", 450);       System.out.println("IdentityHashMap elements\n"+ m);       System.out.println("Size = " + m.size());       // remove all elements       m.clear();       System.out.println("\nUpdated IdentityHashMap elements = "+ m);       System.out.println("Size = " + m.size());    } }

Output

The output is as follows

IdentityHashMap elements {2=200, 4=150, 9=350, 7=90, 10=450, 6=50, 5=110, 8=250, 1=100, 3=300} Size = 10 Updated IdentityHashMap elements = {} Size = 0