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.
307Please respect copyright.ＰＥＮＡＮＡPIBtkcgJpM
Two Pointers
class Solution {307Please respect copyright.ＰＥＮＡＮＡCkkHNW2pZV
// Return true if the character is a vowel (case-insensitive)307Please respect copyright.ＰＥＮＡＮＡkfyZcj7iUR
// booleann(for ture or false), 創造"isVowel"(class), 命名(char c), and add aeiouAEIOU307Please respect copyright.ＰＥＮＡＮＡA3tQjevT2c
// 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。307Please respect copyright.ＰＥＮＡＮＡDUDnbf5IN1
boolean isVowel(char c) {307Please respect copyright.ＰＥＮＡＮＡstT26rcbAt
return c == 'a' || c == 'i' || c == 'e' || c == 'o' || c == 'u'307Please respect copyright.ＰＥＮＡＮＡtMqXfq2Gcc
|| c == 'A' || c == 'I' || c == 'E' || c == 'O' || c == 'U';307Please respect copyright.ＰＥＮＡＮＡziv43XQNan
}307Please respect copyright.ＰＥＮＡＮＡlZEDFo82iy
307Please respect copyright.ＰＥＮＡＮＡShTxAQU8MI
// Function to swap characters at index x and y307Please respect copyright.ＰＥＮＡＮＡP7hmYkpvbd
void swap(char[] chars, int x, int y) {307Please respect copyright.ＰＥＮＡＮＡQVYZF4sqP7
char temp = chars[x];307Please respect copyright.ＰＥＮＡＮＡ1k6vQfb1Ap
chars[x] = chars[y];307Please respect copyright.ＰＥＮＡＮＡIHalypeTXf
chars[y] = temp;307Please respect copyright.ＰＥＮＡＮＡ0npbOFuQiS
}307Please respect copyright.ＰＥＮＡＮＡXEPNZnHzGm
307Please respect copyright.ＰＥＮＡＮＡ0KSLCD9YaU
public String reverseVowels(String s) {307Please respect copyright.ＰＥＮＡＮＡLYSRS3mShy
// 設定最左的字母是[0]307Please respect copyright.ＰＥＮＡＮＡ2A5BQzUGOr
int start = 0;307Please respect copyright.ＰＥＮＡＮＡ9Xvi6LqLOx
// 設定最右的字母是[文字總長度-1].307Please respect copyright.ＰＥＮＡＮＡHbNBh2Qzma
int end = s.length() - 1;307Please respect copyright.ＰＥＮＡＮＡ2cnoDtogQ0
// 將 String 轉換為 char 數組，因為 String 在 Java 中是不可變的307Please respect copyright.ＰＥＮＡＮＡkCs0dWDiBj
char[] sChar = s.toCharArray();307Please respect copyright.ＰＥＮＡＮＡ0uAQdK1fjC
307Please respect copyright.ＰＥＮＡＮＡJ5ttyh5S2X
// While we still have characters to traverse307Please respect copyright.ＰＥＮＡＮＡlT0VoKfodL
// while the word more than one letter, do this function307Please respect copyright.ＰＥＮＡＮＡVQPtwxqHKa
while (start < end) {307Please respect copyright.ＰＥＮＡＮＡQcqLD1lvxk
// Find the leftmost vowel307Please respect copyright.ＰＥＮＡＮＡNYJxWzGT7D
// while start 少於 string length() 同時 [start] 不是vowel，return start ++307Please respect copyright.ＰＥＮＡＮＡ6Th1sm0NNh
while (start < s.length () && !isVowel(sChar[start])) {307Please respect copyright.ＰＥＮＡＮＡDpzdaHPJYc
start++;307Please respect copyright.ＰＥＮＡＮＡNESOwvf9cs
}307Please respect copyright.ＰＥＮＡＮＡd5mArgpXeX
// Find the rightmost vowel307Please respect copyright.ＰＥＮＡＮＡn8fMJ9sbQq
// while end 大於 0 同時 [end] 不是vowel，return end --307Please respect copyright.ＰＥＮＡＮＡ3ZdiHOKHWA
while (end >= 0 && !isVowel(sChar[end])) {307Please respect copyright.ＰＥＮＡＮＡE2Dq4c92Us
end--;307Please respect copyright.ＰＥＮＡＮＡnSoSdzFykc
}307Please respect copyright.ＰＥＮＡＮＡNiCe2PDrVL
// Swap them if start is left of end307Please respect copyright.ＰＥＮＡＮＡjAgi3Z16Ww
// swap function: (in what string, value 1, value 2), swap value 1 and 2307Please respect copyright.ＰＥＮＡＮＡSVPGlBPj3F
if (start < end) {307Please respect copyright.ＰＥＮＡＮＡ65MUKqTTT2
swap(sChar, start++, end--);307Please respect copyright.ＰＥＮＡＮＡ9hXDEthLPr
}307Please respect copyright.ＰＥＮＡＮＡi6bvWUI0Cv
}307Please respect copyright.ＰＥＮＡＮＡalvNhON0Xm
307Please respect copyright.ＰＥＮＡＮＡYvi0Wgj5vL
// Converting char array back to String307Please respect copyright.ＰＥＮＡＮＡrOPVQJVOrI
// 顯示新的String307Please respect copyright.ＰＥＮＡＮＡt0yaN2Ikpc
return new String(sChar);307Please respect copyright.ＰＥＮＡＮＡYkr2pn9BNn
}307Please respect copyright.ＰＥＮＡＮＡVgr9FVlDjM
};
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