added HashMap

18_Hashing/linked_hm.java

@@ -0,0 +1,29 @@
+import java.util.*;
+public class linked_hm{
+    public static void main(String[] args) {
+
+        LinkedHashMap <String, Integer> lhm = new LinkedHashMap<>();
+        //in linked hashmap the way you insert the simmilar way result printing..
+        lhm .put("India", 100);
+        lhm .put("Australia", 160);
+        lhm .put("England", 60);
+
+
+        HashMap <String, Integer> hm = new HashMap<>();  //here Random order it's printing.
+        hm .put("India", 100);
+        hm .put("Australia", 160);
+        hm .put("England", 60);
+
+        //Tree Map..
+        TreeMap<String , Integer > thm = new TreeMap<>();
+        //The treeMap is implemented using Red - Black BST ..
+        //In TreeMap value are sorted according to 'Key' alphabetical  order like- A B C D E F G ..X Y Z.
+         thm .put("India", 100);
+         thm .put("Australia", 160);
+         thm .put("England", 60);
+
+        System.out.println(lhm);
+        System.out.println(hm);
+        System.out.println(thm); // print base on 'key'..
+    }
+}