LeetCode-Encode and Decode TinyURL

Description：

TinyURL is a URL shortening service where you enter a URL such as ​​​https://leetcode.com/problems/design-tinyurl​​​ and it returns a short URL such as ​​http://tinyurl.com/4e9iAk​​.

Design the encode and decode methods for the TinyURL service. There is no restriction on how your encode/decode algorithm should work. You just need to ensure that a URL can be encoded to a tiny URL and the tiny URL can be decoded to the original URL.

public class Codec {
    private int cnt = 0;
    private Map<String, String> table = new HashMap<>();

    // Encodes a URL to a shortened URL.
    public String encode(String longUrl) {
        String result = "https://tinyrul.com/" + cnt;
        cnt++;
        table.put(result, longUrl);
        return result;
    }

    // Decodes a shortened URL to its original URL.
    public String decode(String shortUrl) {
        String result = table.get(shortUrl);
        return result;
    }
}

// Your Codec object will be instantiated and called as such:
// Codec codec = new Codec();
// codec.decode(codec.encode(url));