Unique Email Address

本文主要是介绍Unique Email Address，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

 

思路1：面试的时候可以自己写process method

class Solution {public int numUniqueEmails(String[] emails) {if(emails == null || emails.length == 0) {return 0;}HashSet<String> set = new HashSet<String>();for(String email: emails) {String unique = parseEmail(email);set.add(unique);}return set.size();}private String parseEmail(String email) {String[] splits = email.split("@");String localname = splits[0];String domain = splits[1];return process(localname) + "@" + domain;}private String process(String localname) {StringBuilder sb = new StringBuilder();for(int i = 0; i < localname.length(); i++) {char c = localname.charAt(i);if(c == '.') {continue;} else if(c == '+'){break;} else {sb.append(c);}}return sb.toString();}
}

思路2：如果知道split("\\+");那么取第一个split[0]就可以了，然后replace(".","");

class Solution {public int numUniqueEmails(String[] emails) {if(emails == null || emails.length == 0) {return 0;}HashSet<String> set = new HashSet<String>();for(String email: emails) {String unique = parseEmail(email);set.add(unique);}return set.size();}private String parseEmail(String email) {String[] splits = email.split("@");String[] localname = splits[0].split("\\+");String domain = splits[1];return localname[0].replace(".","") + "@" + domain;}  
}

 

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