Add two leetcode question solution in java

Java/XOR_peration_in_an_Array.java

@@ -0,0 +1,24 @@
+package Leetcode.String;
+
+import java.util.Scanner;
+
+public class XOR_peration_in_an_Array {
+    public static void main(String[] args) {
+        Scanner scanner=new Scanner(System.in);
+        int n=scanner.nextInt();
+        int start=scanner.nextInt();
+        System.out.println(xorOperation(n,start));
+    }
+    public static int xorOperation(int n, int start) {
+        int[] arr=new int[n];
+       for (int i=0;i<n;i++){
+           arr[i]=start+i*2;
+       }
+       int out=arr[0];
+        for (int i=1;i<n;i++){
+            out=out^arr[i];
+        }
+
+        return out;
+    }
+}

Java/unique_Morse_Code_Words.java

@@ -0,0 +1,29 @@
+package Leetcode.String;
+
+import java.util.HashSet;
+import java.util.Scanner;
+
+public class Unique_Morse_Code_Words {
+    public static void main(String[] args) {
+        Scanner scanner=new Scanner(System.in);
+        int size=scanner.nextInt();
+        String[] word={"gin", "zen", "gig", "msg"};
+
+        System.out.println(uniqueMorseRepresentations(word));
+
+    }
+    public static int uniqueMorseRepresentations(String[] words) {
+       String[] morsecode={".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."};
+       char fir='a';
+        HashSet<String> hs=new HashSet<>();
+        String s="";
+        for (int i=0;i<words.length;i++){
+            s="";
+            for (int j=0;j<words[i].length();j++){
+               s=s+morsecode[(words[i].charAt(j))-fir];
+            }
+            hs.add(s);
+        }
+        return hs.size();
+    }
+}