making of hashmaps

Hashing/hashmap.java

@@ -0,0 +1,34 @@
+package Hashing;
+import java.util.*;
+public class hashmap {
+    public static void main(String[] args) {
+        HashMap<String,Integer> h=new HashMap<>();
+
+        //insertion
+        h.put("India", 100);
+        h.put("China", 150);
+        h.put("Paki", 50);
+        System.out.println(h);
+
+        //get operation
+        int population=h.get("India");
+        System.out.println("Population of india is : "+population);
+
+        //contains key
+        System.out.println(h.containsKey("paki"));
+        System.out.println(h.containsKey("Paki"));//case sensitive
+
+        //remove
+        h.remove("China");
+        System.out.println(h);
+
+        //size
+        System.out.println(h.size());
+        System.out.println();
+        //clear
+        h.clear();
+        //is empty
+        System.out.println(h.isEmpty());
+
+    }
+}