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a_345.java
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30 lines (28 loc) · 1.08 KB
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package doublepointer;
import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.HashSet;
public class a_345 {
//Set最重要属性用来查询归属性。使用contains()方法
//HashSet专门对快速查询进行了优化
private static final HashSet set = new HashSet(Arrays.asList('a','e','i','o','u','A','E','I','O','U'));
public String reverseVowels(String s) {
int i = 0, j = s.length()-1;
//之前想将字符串放在一个字符数组中，在进行左右遍历
//以下方法：不提前用字符串s初始化字符数组，而是通过set集合查询元素之后逐步初始化arr数组
char[] arr = new char[s.length()];
while (i <= j) {
char left = s.charAt(i);
char right = s.charAt(j);
if (!set.contains(left)) {
arr[i++] = left;
} else if (!set.contains(right)) {
arr[j--] = right;
} else {
arr[i++] = right;
arr[j--] = left;
}
}
return new String(arr);
}
}