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Add Solution2.java to problems 0687

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	`1`	`+/**`
	`2`	`+ * Definition for a binary tree node.`
	`3`	`+ * public class TreeNode {`
	`4`	`+ * int val;`
	`5`	`+ * TreeNode left;`
	`6`	`+ * TreeNode right;`
	`7`	`+ * TreeNode(int x) { val = x; }`
	`8`	`+ * }`
	`9`	`+ */`
	`10`	`+`
	`11`	`+class Solution {`
	`12`	`+`
	`13`	`+ private int maxL = 0;`
	`14`	`+`
	`15`	`+ public int longestUnivaluePath(TreeNode root) {`
	`16`	`+ if(root == null) return 0;`
	`17`	`+ getMaxL(root, root.val);`
	`18`	`+ return maxL;`
	`19`	`+ }`
	`20`	`+`
	`21`	`+ private int getMaxL(TreeNode r, int val) {`
	`22`	`+ if (r == null) return 0;`
	`23`	`+ int left = getMaxL(r.left, r.val);`
	`24`	`+ int right = getMaxL(r.right, r.val);`
	`25`	`+ maxL = Math.max(maxL, left + right);`
	`26`	`+ return r.val == val ? Math.max(left, right) + 1 : 0;`
	`27`	`+ }`
	`28`	`+}`

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