Given s = “leetcode”, return “leotcede”.
- 思路：使用双指针指向待反转的两个元音字符，一个指针从头向尾遍历，一个指针从尾到头遍历。
/**
* 3. 反转字符串中的元音字符
* aeiou
* Given s = "leetcode", return "leotcede".
* @author 林博弈
*
*/
public class Three_元音字符 {
public static void main(String[] args) {
String string = "leetcode";
char[] arr = reverseVowels(string);
for(char c:arr)System.out.print(c+",");
}
public static char[] reverseVowels(String s){
char[] vowels = {'a','e','i','o','u','A','E','I','O','U'};
char[] arrs = s.toCharArray();
int start = 0;
int end = arrs.length-1;
while(start<end){
while(start<arrs.length-1){
for(char c:vowels){
if(arrs[start]==c){
break;
}
start++;
}
}
while(end>0){
for(char c:vowels){
if(arrs[end]==c){
break;
}
end--;
}
}
char temp = arrs[start];
arrs[start] = arrs[end];
arrs[end] = temp;
start++;
end--;
}
return arrs;
}
}