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.
379Please respect copyright.ＰＥＮＡＮＡX0hKhpleQN
Two Pointers
class Solution {379Please respect copyright.ＰＥＮＡＮＡTRQTBbY74K
// Return true if the character is a vowel (case-insensitive)379Please respect copyright.ＰＥＮＡＮＡAjDDQLLoBy
// booleann(for ture or false), 創造"isVowel"(class), 命名(char c), and add aeiouAEIOU379Please respect copyright.ＰＥＮＡＮＡtorjwIsQNA
// 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。379Please respect copyright.ＰＥＮＡＮＡXzq7Lt1Olt
boolean isVowel(char c) {379Please respect copyright.ＰＥＮＡＮＡf0P7bLtlOE
return c == 'a' || c == 'i' || c == 'e' || c == 'o' || c == 'u'379Please respect copyright.ＰＥＮＡＮＡgYb78gEc5g
|| c == 'A' || c == 'I' || c == 'E' || c == 'O' || c == 'U';379Please respect copyright.ＰＥＮＡＮＡxqNmcNDtX6
}379Please respect copyright.ＰＥＮＡＮＡ3TVK1K4lkN
379Please respect copyright.ＰＥＮＡＮＡCtEn2cd4wr
// Function to swap characters at index x and y379Please respect copyright.ＰＥＮＡＮＡVkvmB6tT1f
void swap(char[] chars, int x, int y) {379Please respect copyright.ＰＥＮＡＮＡu0ASsZsbyp
char temp = chars[x];379Please respect copyright.ＰＥＮＡＮＡ8EArPH0vsD
chars[x] = chars[y];379Please respect copyright.ＰＥＮＡＮＡ7Rfp8WglwQ
chars[y] = temp;379Please respect copyright.ＰＥＮＡＮＡCQzy3kuIfa
}379Please respect copyright.ＰＥＮＡＮＡP5EOXTpygZ
379Please respect copyright.ＰＥＮＡＮＡVF2QDHkHah
public String reverseVowels(String s) {379Please respect copyright.ＰＥＮＡＮＡvuPWJoSEkP
// 設定最左的字母是[0]379Please respect copyright.ＰＥＮＡＮＡnQD0VnRzRX
int start = 0;379Please respect copyright.ＰＥＮＡＮＡ92NVTA54rc
// 設定最右的字母是[文字總長度-1].379Please respect copyright.ＰＥＮＡＮＡ6CC2tPcMUg
int end = s.length() - 1;379Please respect copyright.ＰＥＮＡＮＡwHvyUoJDsQ
// 將 String 轉換為 char 數組，因為 String 在 Java 中是不可變的379Please respect copyright.ＰＥＮＡＮＡ5DEROTEJsp
char[] sChar = s.toCharArray();379Please respect copyright.ＰＥＮＡＮＡk0IPtVJuqv
379Please respect copyright.ＰＥＮＡＮＡGIqzHzrNRP
// While we still have characters to traverse379Please respect copyright.ＰＥＮＡＮＡFO0qtL9qgO
// while the word more than one letter, do this function379Please respect copyright.ＰＥＮＡＮＡ4WOVF55BXM
while (start < end) {379Please respect copyright.ＰＥＮＡＮＡIAqxjA2xN8
// Find the leftmost vowel379Please respect copyright.ＰＥＮＡＮＡ3WJRNzT1ff
// while start 少於 string length() 同時 [start] 不是vowel，return start ++379Please respect copyright.ＰＥＮＡＮＡxnSdKQUmzP
while (start < s.length () && !isVowel(sChar[start])) {379Please respect copyright.ＰＥＮＡＮＡ1nY9eK9rOG
start++;379Please respect copyright.ＰＥＮＡＮＡa0y7CpkNJX
}379Please respect copyright.ＰＥＮＡＮＡ7cRNiUporH
// Find the rightmost vowel379Please respect copyright.ＰＥＮＡＮＡSs9hlRiLGE
// while end 大於 0 同時 [end] 不是vowel，return end --379Please respect copyright.ＰＥＮＡＮＡKvlaGhbp0P
while (end >= 0 && !isVowel(sChar[end])) {379Please respect copyright.ＰＥＮＡＮＡO6IMMgpW5p
end--;379Please respect copyright.ＰＥＮＡＮＡ1IxpMEUenW
}379Please respect copyright.ＰＥＮＡＮＡ3cx0dNa2Dg
// Swap them if start is left of end379Please respect copyright.ＰＥＮＡＮＡYiNTOVMcfy
// swap function: (in what string, value 1, value 2), swap value 1 and 2379Please respect copyright.ＰＥＮＡＮＡ7UwdtqlrFr
if (start < end) {379Please respect copyright.ＰＥＮＡＮＡAQF8fHlWRs
swap(sChar, start++, end--);379Please respect copyright.ＰＥＮＡＮＡynkjIoFldI
}379Please respect copyright.ＰＥＮＡＮＡYk5Ce1pw7N
}379Please respect copyright.ＰＥＮＡＮＡBWP0ymuf5R
379Please respect copyright.ＰＥＮＡＮＡ28CpBfKpk8
// Converting char array back to String379Please respect copyright.ＰＥＮＡＮＡsgdrFpvxpT
// 顯示新的String379Please respect copyright.ＰＥＮＡＮＡGcIiGYuPQ2
return new String(sChar);379Please respect copyright.ＰＥＮＡＮＡLdCKa8zf8z
}379Please respect copyright.ＰＥＮＡＮＡiBEmMAoE5a
};
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