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Copy pathValidIPAddress.java
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68 lines (63 loc) · 1.81 KB
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package com.leetcode.string;
public class ValidIPAddress {
/**
* IPv6,Neither,IPv4
* @param IP
* @return
*/
public String validIPAddress(String IP) {
if(IP==null||"".equals(IP)) {
return "Neither";
}
if(IP.contains(".")){
return ipV4(IP);
}else if(IP.contains(":")){
return ipV6(IP);
}else{
return "Neither";
}
}
public String ipV4(String IP){
// limit ==-1 分割出以.开头或者结尾的空字符串
String[] ipSegments = IP.split("\\.",-1);
if(ipSegments.length!=4){
return "Neither";
}
for(String s:ipSegments){
if(s.length()==0||s.length()>3||(s.charAt(0)=='0'&&s.length()>1)){
return "Neither";
}
for(int i=0;i<s.length();i++){
if(!Character.isDigit(s.charAt(i))){
return "Neither";
}
}
int val = Integer.parseInt(s);
if(val>255){
return "Neither";
}
}
return "IPv4";
}
public String ipV6(String IP){
String[] ipSegments = IP.split("\\:",-1);
if(ipSegments.length!=8){
return "Neither";
}
for(String s:ipSegments){
if(s.length()==0||s.length()>4){
return "Neither";
}
for(int i=0;i<s.length();i++){
char ch = s.charAt(i);
if(!Character.isDigit(ch)&&(Character.toLowerCase(ch)>'f'||Character.toLowerCase(ch)<'a')){
return "Neither";
}
}
}
return "IPv6";
}
public static void main(String[] args) {
System.out.println(Character.toLowerCase('0'));
}
}