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.
312Please respect copyright.ＰＥＮＡＮＡAQeJb6aDY9
Two Pointers
class Solution {312Please respect copyright.ＰＥＮＡＮＡd4p1sWClWD
// Return true if the character is a vowel (case-insensitive)312Please respect copyright.ＰＥＮＡＮＡUalBeHvwqk
// booleann(for ture or false), 創造"isVowel"(class), 命名(char c), and add aeiouAEIOU312Please respect copyright.ＰＥＮＡＮＡpCYclWId3R
// 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。312Please respect copyright.ＰＥＮＡＮＡ30QEEJZk8z
boolean isVowel(char c) {312Please respect copyright.ＰＥＮＡＮＡrZt4nhLIjY
return c == 'a' || c == 'i' || c == 'e' || c == 'o' || c == 'u'312Please respect copyright.ＰＥＮＡＮＡLiIPWHjuZ9
|| c == 'A' || c == 'I' || c == 'E' || c == 'O' || c == 'U';312Please respect copyright.ＰＥＮＡＮＡm1d2JfCQkn
}312Please respect copyright.ＰＥＮＡＮＡihrvEqdTEl
312Please respect copyright.ＰＥＮＡＮＡ0vTy4m23sv
// Function to swap characters at index x and y312Please respect copyright.ＰＥＮＡＮＡXgKo8FF0Mf
void swap(char[] chars, int x, int y) {312Please respect copyright.ＰＥＮＡＮＡ7ySPAOdRyl
char temp = chars[x];312Please respect copyright.ＰＥＮＡＮＡij9F7HhEjC
chars[x] = chars[y];312Please respect copyright.ＰＥＮＡＮＡ9BK6xoFZm3
chars[y] = temp;312Please respect copyright.ＰＥＮＡＮＡP2gODi6NWt
}312Please respect copyright.ＰＥＮＡＮＡXne9X7yKUl
312Please respect copyright.ＰＥＮＡＮＡcn2l50flJi
public String reverseVowels(String s) {312Please respect copyright.ＰＥＮＡＮＡLflDAk61gZ
// 設定最左的字母是[0]312Please respect copyright.ＰＥＮＡＮＡrkwTHNTjbm
int start = 0;312Please respect copyright.ＰＥＮＡＮＡtQNXREQSZY
// 設定最右的字母是[文字總長度-1].312Please respect copyright.ＰＥＮＡＮＡOWlMpKDSlM
int end = s.length() - 1;312Please respect copyright.ＰＥＮＡＮＡSa62cFbtrF
// 將 String 轉換為 char 數組，因為 String 在 Java 中是不可變的312Please respect copyright.ＰＥＮＡＮＡ5biISQOScK
char[] sChar = s.toCharArray();312Please respect copyright.ＰＥＮＡＮＡGWmt040evz
312Please respect copyright.ＰＥＮＡＮＡA7G5n3BPny
// While we still have characters to traverse312Please respect copyright.ＰＥＮＡＮＡiDB9giOwkx
// while the word more than one letter, do this function312Please respect copyright.ＰＥＮＡＮＡPEfz2Iwjf0
while (start < end) {312Please respect copyright.ＰＥＮＡＮＡHey83vtlBW
// Find the leftmost vowel312Please respect copyright.ＰＥＮＡＮＡZ481C5nerl
// while start 少於 string length() 同時 [start] 不是vowel，return start ++312Please respect copyright.ＰＥＮＡＮＡnTqcIFsWNO
while (start < s.length () && !isVowel(sChar[start])) {312Please respect copyright.ＰＥＮＡＮＡxXI2480573
start++;312Please respect copyright.ＰＥＮＡＮＡuwyoE8mXEU
}312Please respect copyright.ＰＥＮＡＮＡLIs0KxO83M
// Find the rightmost vowel312Please respect copyright.ＰＥＮＡＮＡ78gDVTTYLp
// while end 大於 0 同時 [end] 不是vowel，return end --312Please respect copyright.ＰＥＮＡＮＡ4ohKsu4dWV
while (end >= 0 && !isVowel(sChar[end])) {312Please respect copyright.ＰＥＮＡＮＡNOG8PFLOS8
end--;312Please respect copyright.ＰＥＮＡＮＡNbhxYmim0M
}312Please respect copyright.ＰＥＮＡＮＡ3Au58w9ZxG
// Swap them if start is left of end312Please respect copyright.ＰＥＮＡＮＡb2gDL84PCU
// swap function: (in what string, value 1, value 2), swap value 1 and 2312Please respect copyright.ＰＥＮＡＮＡMfHUmTZ6R1
if (start < end) {312Please respect copyright.ＰＥＮＡＮＡyAsZ1nZGvu
swap(sChar, start++, end--);312Please respect copyright.ＰＥＮＡＮＡm1k7e0wt0n
}312Please respect copyright.ＰＥＮＡＮＡ5ViZplYEMY
}312Please respect copyright.ＰＥＮＡＮＡGamQVBRRe0
312Please respect copyright.ＰＥＮＡＮＡY8OIakyUPs
// Converting char array back to String312Please respect copyright.ＰＥＮＡＮＡUBimfBhFJ0
// 顯示新的String312Please respect copyright.ＰＥＮＡＮＡ1z7I3GptKf
return new String(sChar);312Please respect copyright.ＰＥＮＡＮＡ5hMwxrTc1G
}312Please respect copyright.ＰＥＮＡＮＡ9jj1V7mMMl
};
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