Method printNode

src/com/blankj/structure/TreeNode.java:83–90

(int val)

    }

    private static void printNode(int val) {
        StringBuilder res = new StringBuilder(val + "<");
        int spaceNum = space.length() - res.length();
        for (int i = 0; i < spaceNum; i++) {
            res.append(" ");
        }
        System.out.println(res);
    }
}