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Add Solution.java to problems 0404

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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`	`+class Solution {`
	`11`	`+`
	`12`	`+ private int sum = 0;`
	`13`	`+`
	`14`	`+ public int sumOfLeftLeaves(TreeNode root) {`
	`15`	`+ if (root == null) return 0;`
	`16`	`+ if (root.left != null && root.left.left == null && root.left.right == null) {`
	`17`	`+ sum += root.left.val;`
	`18`	`+ }`
	`19`	`+ sumOfLeftLeaves(root.left);`
	`20`	`+ sumOfLeftLeaves(root.right);`
	`21`	`+ return sum;`
	`22`	`+ }`
	`23`	`+}`

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