Create First_letter_to_apper_twice.java

Author: beingshub02

LeetCode/First_letter_to_apper_twice.java

@@ -0,0 +1,15 @@
+class Solution {
+    public char repeatedCharacter(String s) {
+        HashSet<Character> c =new HashSet<>();
+        char ch='a';
+        for(int i=0;i<s.length();i++){
+            ch = s.charAt(i);
+            if(c.isEmpty()!=true && c.contains(ch)){
+                return ch;
+            }else{
+                c.add(ch);
+            }
+        }
+        return ch;
+    }
+}