反转字符串 about pisecespeng.record.me HOT 2 CLOSED

public static void func(char[] s) {
    // 循环交换
    for (int i = 0, lastIdx = s.length - 1; i < s.length / 2; i++) {
        char tmp = s[i];
        s[i] = s[lastIdx - i];
        s[lastIdx - i] = tmp;
    }
}

public static void func(char[] s) {
    int n = s.length;
    for (int left = 0, right = n - 1; left < right; ++left, --right) {
        char tmp = s[left];
        s[left] = s[right];
        s[right] = tmp;
    }
}