1、題目：

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.

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Example 1:

Input: ["Hello", "Alaska", "Dad", "Peace"] Output: ["Alaska", "Dad"]

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2、代碼實(shí)現(xiàn)：

import java.util.ArrayList; public class Solution {public ArrayList<String> resultList;//檢驗(yàn)這個(gè)字符串是否全在同一行public boolean check(String s1, String s2) {if (s1 == null) {return false;}for (int i = 0; i < s1.length(); ++i) {if (s2.indexOf(s1.charAt(i)) == -1) {return false;}}return true;}public String[] findWords(String[] words) {//檢驗(yàn)字符串?dāng)?shù)組是否都為nullif (words == null) {return null;}int length = words.length;String s1 = "qwertyuiop";String s2 = "asdfghjkl";String s3 = "zxcvbnm";resultList = new ArrayList<String>();//判斷每次for (int i = 0; i < length; ++i) {String lowerStr = words[i].toLowerCase();if (lowerStr != "") {if (s1.indexOf(lowerStr.charAt(0)) != -1) {if(check(lowerStr, s1))resultList.add(words[i]);}if (s2.indexOf(lowerStr.charAt(0)) != -1) {if(check(lowerStr, s2))resultList.add(words[i]);}if (s3.indexOf(lowerStr.charAt(0)) != -1) {if(check(lowerStr, s3))resultList.add(words[i]);} }}String[] strArr = new String[resultList.size()];resultList.toArray(strArr);return strArr;} }
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3、遇到的問(wèn)題：

特么我一開(kāi)始把在if后面加了 if(check(lowerStr, s1)); 導(dǎo)致所有的數(shù)據(jù)都加進(jìn)去了，以后要注意，不要亂雞吧寫，在if后面加上; 創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來(lái)咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

總結(jié)

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