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Java Solution for LeetCode algorithm problems, continually updating
468\. Validate IP Address
Medium
Given a string `queryIP`, return `"IPv4"` if IP is a valid IPv4 address, `"IPv6"` if IP is a valid IPv6 address or `"Neither"` if IP is not a correct IP of any type.
**A valid IPv4** address is an IP in the form "x1.x2.x3.x4" where 0 <= xi <= 255 and xi **cannot contain** leading zeros. For example, `"192.168.1.1"` and `"192.168.1.0"` are valid IPv4 addresses but `"192.168.01.1"`, while `"192.168.1.00"` and `"[email protected]"` are invalid IPv4 addresses.
**A valid IPv6** address is an IP in the form "x1:x2:x3:x4:x5:x6:x7:x8" where:
* 1 <= xi.length <= 4
* xi is a **hexadecimal string** which may contain digits, lower-case English letter (`'a'` to `'f'`) and upper-case English letters (`'A'` to `'F'`).
* Leading zeros are allowed in xi.
For example, "`2001:0db8:85a3:0000:0000:8a2e:0370:7334"` and "`2001:db8:85a3:0:0:8A2E:0370:7334"` are valid IPv6 addresses, while "`2001:0db8:85a3::8A2E:037j:7334"` and "`02001:0db8:85a3:0000:0000:8a2e:0370:7334"` are invalid IPv6 addresses.
**Example 1:**
**Input:** queryIP = "172.16.254.1"
**Output:** "IPv4"
**Explanation:** This is a valid IPv4 address, return "IPv4".
**Example 2:**
**Input:** queryIP = "2001:0db8:85a3:0:0:8A2E:0370:7334"
**Output:** "IPv6"
**Explanation:** This is a valid IPv6 address, return "IPv6".
**Example 3:**
**Input:** queryIP = "256.256.256.256"
**Output:** "Neither"
**Explanation:** This is neither a IPv4 address nor a IPv6 address.
**Constraints:**
* `queryIP` consists only of English letters, digits and the characters `'.'` and `':'`.