diff --git a/Easy/Isomorphic Strings.java b/Easy/Isomorphic Strings.java
new file mode 100644
index 0000000..2a20cd3
--- /dev/null
+++ b/Easy/Isomorphic Strings.java	
@@ -0,0 +1,20 @@
+class Solution {
+    public boolean isIsomorphic(String s, String t) {
+        HashMap<Character,Character> map1 = new HashMap<>();
+        HashMap<Character,Character> map2 = new HashMap<>();
+        for(int i=0; i<s.length(); i++){
+            char ch1 =s.charAt(i);
+            char ch2 =t.charAt(i);
+            if(!map1.containsKey(ch1)){
+                map1.put(ch1,ch2);
+            }
+             if(!map2.containsKey(ch2)){
+                map2.put(ch2,ch1);
+            }
+            if(map1.get(ch1)!=ch2 || map2.get(ch2)!=ch1){
+            return false;
+            }
+        }
+        return true;
+    }
+}
\ No newline at end of file