Create 0535. Encode and Decode TinyURL

Author: haibarawu

0535. Encode and Decode TinyURL

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+/****************************************
+535. Encode and Decode TinyURL
+
+Difficulty: Medium
+
+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 Map<Integer, String> map = new HashMap();
+    
+    // Encodes a URL to a shortened URL.
+    public String encode(String longUrl) {
+        int encode = longUrl.hashCode();
+        map.put(encode, longUrl);
+        return "http://tinyurl.com/" + encode;
+    }
+
+    // Decodes a shortened URL to its original URL.
+    public String decode(String shortUrl) {
+        int decode = Integer.parseInt(shortUrl.replace("http://tinyurl.com/", ""));
+        return map.get(decode);
+        
+    }
+}
+
+// Your Codec object will be instantiated and called as such:
+// Codec codec = new Codec();
+// codec.decode(codec.encode(url));