Added Java 617 Merge Two Binary Trees

Author: miladra

java/617-Merge-Two-Binary-Trees.java

@@ -0,0 +1,21 @@
+class Solution {
+    public TreeNode mergeTrees(TreeNode root1, TreeNode root2) {
+        
+        if(root1 == null && root2 == null) return null;
+        
+        int val1 =  root1 != null ? root1.val : 0;
+        int val2 =  root2 != null ? root2.val : 0;
+        
+        TreeNode root = new TreeNode(val1+val2);
+        
+        // merge left side of trees if they are not null
+        root.left  = mergeTrees((root1 != null && root1.left != null)  ? root1.left : null ,  (root2 != null && root2.left != null)  ? root2.left : null);
+
+        // merge righ side of trees if they are not null
+        root.right = mergeTrees((root1 != null && root1.right != null) ? root1.right : null , (root2 !=null && root2.right != null) ? root2.right: null );
+        
+        return root;
+    }
+}
+
+