Create Palindrome-number.java and Updated README.md (#139)

* update README file with Palindrome-number problem

* create palindrome-number.java

* update README file with Path-Sum problem

* create path-sum.java

Author: sujin0529

Java/palindrome-number.java

@@ -0,0 +1,19 @@
+class Solution {
+    public boolean isPalindrome(int x) {
+        String _x = x+""; // integer convert string
+        String rev = ""; // store reverse
+        int i = 0;
+        for(i = _x.length()-1; i>=0; i--){
+            rev += _x.charAt(i); 
+        }
+        
+        if(_x.compareTo(rev) == 0){
+            // correct
+            return true;
+        }
+        else{
+            return false;
+        }
+        
+    }
+}

Java/path-sum.java

@@ -0,0 +1,40 @@
+/**
+ * Definition for a binary tree node.
+ * public class TreeNode {
+ *     int val;
+ *     TreeNode left;
+ *     TreeNode right;
+ *     TreeNode() {}
+ *     TreeNode(int val) { this.val = val; }
+ *     TreeNode(int val, TreeNode left, TreeNode right) {
+ *         this.val = val;
+ *         this.left = left;
+ *         this.right = right;
+ *     }
+ * }
+ */
+class Solution {
+    public boolean hasPathSum(TreeNode root, int sum) {
+        if(root == null){
+            // exception
+            return false;
+        }
+        if(root.left == null && root.right == null){
+            if(sum == root.val){
+                return true;
+            }
+            return false;
+        }
+        else{
+            boolean left = false;
+            boolean right = false;
+            if(root.left != null){
+                left = hasPathSum(root.left, sum-root.val);
+            }
+            if(root.right != null){
+                right = hasPathSum(root.right, sum-root.val);
+            }
+            return left||right;
+        }
+    }
+}

README.md

@@ -159,6 +159,7 @@ Check out ---> [Sample PR](https://github.com/codedecks-in/LeetCode-Solutions/pu
 | 1614 | [Maximum Nesting Depth of the Parentheses](https://leetcode.com/problems/maximum-nesting-depth-of-the-parentheses/)                             | [Java](./Java/max-nesting-depth-parentheses.java)                          | _O(n)_ | _O(1)_ | Easy       |     |                 |
 | 1374 | [Generate a String With Characters That Have Odd Counts](https://leetcode.com/problems/generate-a-string-with-characters-that-have-odd-counts/) | [Java](./Java/generate-a-string-with-characters-that-have-odd-counts.java) | _O(n)_ | _O(1)_ | Easy       |     |                 |
 | 859 | [Buddy Strings](https://leetcode.com/problems/buddy-strings/) | [Java](./Java/buddy-strings.java) | _O(n)_ | _O(1)_ | Easy       |     |                 |
+| 9   | [Palindrome Number](https://leetcode.com/problems/palindrome-number/) | [Java](./Java/palindrome-number.java) | _O(n)_ | _O(1)_ | Easy       |     |                 |
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 <div align="right">
     <b><a href="#algorithms">⬆️ Back to Top</a></b>
@@ -327,6 +328,7 @@ Check out ---> [Sample PR](https://github.com/codedecks-in/LeetCode-Solutions/pu
 | ---- | ------------------------------------------------------------------------------------------- | -------------------------------------------------- | ----------- | ----------- | ---------- | --- | ---- |
 | 1463 | [Cherry Pickup II](https://leetcode.com/problems/cherry-pickup-ii/)                         | [C++](./C++/Cherry-Pickup-II.cpp)                  | _O(n \* m)_ | _O(n \* m)_ | Hard       | DFS |      |
 | 104  | [Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/) | [python](./Python/maximum-depth-of-binary-tree.py) | _O(n)_      | _O(n)_      | Easy       | DFS |      |
+| 112 | [Path Sum](https://leetcode.com/problems/path-sum/) | [Java](./Java/path-sum.java) | _O(n)_ | _O(n)_ | Easy | DFS |     |
 
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