Given a string s, reverse only all the vowels in the string and return it.
The vowels are 'a', 'e', 'i', 'o', and 'u', and they can appear in both lower and upper cases, more than once.
335Please respect copyright.ＰＥＮＡＮＡW0wSJxOTt6
Two Pointers
class Solution {335Please respect copyright.ＰＥＮＡＮＡ61nKK1Rnyg
// Return true if the character is a vowel (case-insensitive)335Please respect copyright.ＰＥＮＡＮＡAoHzcydkvS
// booleann(for ture or false), 創造"isVowel"(class), 命名(char c), and add aeiouAEIOU335Please respect copyright.ＰＥＮＡＮＡolrQBOPnT5
// 當 (char c) 不是vowel，return false/ 是vowel，return true
// * a||b = ab 全为 false 时，计算结果为 false，否则为 true。335Please respect copyright.ＰＥＮＡＮＡjBxACQrTyn
boolean isVowel(char c) {335Please respect copyright.ＰＥＮＡＮＡ1Rny7AU1xs
return c == 'a' || c == 'i' || c == 'e' || c == 'o' || c == 'u'335Please respect copyright.ＰＥＮＡＮＡDSn2rsIDbm
|| c == 'A' || c == 'I' || c == 'E' || c == 'O' || c == 'U';335Please respect copyright.ＰＥＮＡＮＡraLKLU32Di
}335Please respect copyright.ＰＥＮＡＮＡyMksi1Ufg3
335Please respect copyright.ＰＥＮＡＮＡhkHcjyj6jx
// Function to swap characters at index x and y335Please respect copyright.ＰＥＮＡＮＡjCJFoLkBCU
void swap(char[] chars, int x, int y) {335Please respect copyright.ＰＥＮＡＮＡdl8IKZREjd
char temp = chars[x];335Please respect copyright.ＰＥＮＡＮＡ9qQsc70pAs
chars[x] = chars[y];335Please respect copyright.ＰＥＮＡＮＡ63lYDl0pfr
chars[y] = temp;335Please respect copyright.ＰＥＮＡＮＡ6B5zNYyhRJ
}335Please respect copyright.ＰＥＮＡＮＡGkSyrR94Hh
335Please respect copyright.ＰＥＮＡＮＡahMeiaQQGm
public String reverseVowels(String s) {335Please respect copyright.ＰＥＮＡＮＡzVeNX47VFe
// 設定最左的字母是[0]335Please respect copyright.ＰＥＮＡＮＡul2rXj7MIC
int start = 0;335Please respect copyright.ＰＥＮＡＮＡEQOLa28rMM
// 設定最右的字母是[文字總長度-1].335Please respect copyright.ＰＥＮＡＮＡjg1aeQYr3m
int end = s.length() - 1;335Please respect copyright.ＰＥＮＡＮＡemy6Ou8WWu
// 將 String 轉換為 char 數組，因為 String 在 Java 中是不可變的335Please respect copyright.ＰＥＮＡＮＡjf4zozZJNV
char[] sChar = s.toCharArray();335Please respect copyright.ＰＥＮＡＮＡCX92mgWki2
335Please respect copyright.ＰＥＮＡＮＡaaNSlJQIIM
// While we still have characters to traverse335Please respect copyright.ＰＥＮＡＮＡAay7cxVkPJ
// while the word more than one letter, do this function335Please respect copyright.ＰＥＮＡＮＡ5mzQvYLgxB
while (start < end) {335Please respect copyright.ＰＥＮＡＮＡ2JmISWdkID
// Find the leftmost vowel335Please respect copyright.ＰＥＮＡＮＡqAJFIjbZm4
// while start 少於 string length() 同時 [start] 不是vowel，return start ++335Please respect copyright.ＰＥＮＡＮＡDVW29Q221f
while (start < s.length () && !isVowel(sChar[start])) {335Please respect copyright.ＰＥＮＡＮＡROGvV0OxVb
start++;335Please respect copyright.ＰＥＮＡＮＡwR5UdBsFV3
}335Please respect copyright.ＰＥＮＡＮＡ8J7JFjAJKJ
// Find the rightmost vowel335Please respect copyright.ＰＥＮＡＮＡFBrMCi7F5s
// while end 大於 0 同時 [end] 不是vowel，return end --335Please respect copyright.ＰＥＮＡＮＡu8zUMNQU3y
while (end >= 0 && !isVowel(sChar[end])) {335Please respect copyright.ＰＥＮＡＮＡ5XM913EQUw
end--;335Please respect copyright.ＰＥＮＡＮＡMu2UgaMbdy
}335Please respect copyright.ＰＥＮＡＮＡ759jSnDCby
// Swap them if start is left of end335Please respect copyright.ＰＥＮＡＮＡqILpfPA8Kj
// swap function: (in what string, value 1, value 2), swap value 1 and 2335Please respect copyright.ＰＥＮＡＮＡwQEMtxCBTz
if (start < end) {335Please respect copyright.ＰＥＮＡＮＡdyrvtrHIFh
swap(sChar, start++, end--);335Please respect copyright.ＰＥＮＡＮＡhK8XFgXPZ9
}335Please respect copyright.ＰＥＮＡＮＡet2VJwsO2F
}335Please respect copyright.ＰＥＮＡＮＡgjvrwnHxzg
335Please respect copyright.ＰＥＮＡＮＡ5DxYoE2lUC
// Converting char array back to String335Please respect copyright.ＰＥＮＡＮＡYYHHyjO0Nb
// 顯示新的String335Please respect copyright.ＰＥＮＡＮＡ8JMaHpOqwd
return new String(sChar);335Please respect copyright.ＰＥＮＡＮＡLVSo5Dntc2
}335Please respect copyright.ＰＥＮＡＮＡewGciQJx58
};
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