題目
Given a string s, remove the vowels ‘a’, ’e’, ‘i’, ‘o’, and ‘u’ from it, and return the new string.
Example 1:
1Input: s = "leetcodeisacommunityforcoders"
2Output: "ltcdscmmntyfrcdrs"
Example 2:
1Input: s = "aeiou"
2Output: ""
Constraints:
- 1 <= s.length <= 1000
- s consists of only lowercase English letters.
我的思路
由於是將一個 String 中所有的母音都移除,所以我們直接建立一個新的 StringBuilder,將 Input loop 一遍,如果不是母音的話就加入到 StringBuilder 裡面,最後返回 String
Note: 如果不知道為什麼要使用 StringBuilder,可以 google “String concat vs StringBuilde”。
程式碼
1class Solution {
2 public String removeVowels(String s) {
3 StringBuilder result = new StringBuilder();
4
5 for(char c : s.toCharArray()) {
6 if (!isVowels(c)) {
7 result.append(c);
8 }
9 }
10 return result.toString();
11 }
12
13 public boolean isVowels(char c) {
14 if (c == 'a' ||
15 c == 'e' ||
16 c == 'i' ||
17 c == 'o' ||
18 c == 'u') {
19 return true;
20 }
21 return false;
22 }
23}
評論