diff --git a/Hashmap b/Hashmap
new file mode 100644
index 0000000..e4c0c2e
--- /dev/null
+++ b/Hashmap
@@ -0,0 +1,34 @@
+import java.util.*;  
+
+//////////////////naveen hashmap
+class HashMap3{  
+ public static void main(String args[]){  
+   HashMap<Integer,String> hm=new HashMap<Integer,String>();    
+      hm.put(100,"Amit");    
+      hm.put(101,"Vijay");    
+      hm.put(102,"Rahul");   
+      System.out.println("Initial list of elements:");  
+     for(Map.Entry m:hm.entrySet())  
+     {  
+        System.out.println(m.getKey()+" "+m.getValue());   
+     }  
+     System.out.println("Updated list of elements:");  
+     hm.replace(102, "Gaurav");  
+     for(Map.Entry m:hm.entrySet())  
+     {  
+        System.out.println(m.getKey()+" "+m.getValue());   
+     }  
+     System.out.println("Updated list of elements:");  
+     hm.replace(101, "Vijay", "Ravi");  
+     for(Map.Entry m:hm.entrySet())  
+     {  
+        System.out.println(m.getKey()+" "+m.getValue());   
+     }   
+     System.out.println("Updated list of elements:");  
+     hm.replaceAll((k,v) -> "Ajay");  
+     for(Map.Entry m:hm.entrySet())  
+     {  
+        System.out.println(m.getKey()+" "+m.getValue());   
+     }  
+ }  
+}