【LeetCode】500.Keyboard Row_EASY(三)

500.Keyboard Row

Description:
Given a List of words, return the words that can be typed using letters of alphabet on only one row’s of American keyboard like the image below.

Example 1:
Input: [“Hello”, “Alaska”, “Dad”, “Peace”]
Output: [“Alaska”, “Dad”]

Note:
1. You may use one character in the keyboard more than once.
2. You may assume the input string will only contain letters of alphabet.

思路：正则表达式。为了方便，把单词中的字母都转为小写。
代码：

public class Solution {    public String[] findWords(String[] words) {        ArrayList<String> newWords=new ArrayList<String>();        for(String word:words){            if(word.toLowerCase().matches("[qwertyuiop]*|[asdfghjkl]*|[zxcvbnm]*")){                newWords.add(word);            }        }        return newWords.toArray(new String[newWords.size()]);    }}

完成。