Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in the same or another computer environment.
Design an algorithm to serialize and deserialize a binary search tree. There is no restriction on how your serialization/deserialization algorithm should work. You just need to ensure that a binary search tree can be serialized to a string and this string can be deserialized to the original tree structure.
The encoded string should be as compact as possible.
Note: Do not use class member/global/static variables to store states. Your serialize and deserialize algorithms should be stateless.
1 public class Codec {
2 public String serialize(TreeNode root) {
3 StringBuilder sb = new StringBuilder();
4 serialize(root, sb);
5 return sb.toString();
6 }
7
8 public void serialize(TreeNode root, StringBuilder sb) {
9 if (root == null) return;
10 sb.append(root.val).append(",");
11 serialize(root.left, sb);
12 serialize(root.right, sb);
13 }
14
15 // Decodes your encoded data to tree.
16 public TreeNode deserialize(String data) {
17 if (data.isEmpty()) return null;
18 Queue<String> q = new LinkedList<>(Arrays.asList(data.split(",")));
19 return deserialize(q, Integer.MIN_VALUE, Integer.MAX_VALUE);
20 }
21
22 public TreeNode deserialize(Queue<String> q, int lower, int upper) {
23 if (q.isEmpty()) return null;
24 String s = q.peek();
25 int val = Integer.parseInt(s);
26 if (val < lower || val > upper) return null;
27 q.poll();
28 TreeNode root = new TreeNode(val);
29 root.left = deserialize(q, lower, val);
30 root.right = deserialize(q, val, upper);
31 return root;
32 }
33 }
来源：https://www.cnblogs.com/beiyeqingteng/p/12254502.html