JAVA不借助工具类翻转字符，数组

public
static void main(String[] args) {

String[] strs = {"y", "a", "n", "g","f","e","i"};

System.out.println(Arrays.toString(strs));

swap(strs);

System.out.println(Arrays.toString(strs));

}

public
static void swap(String strs[]) {

int len = strs.length;

int as = len / 2;

for (int i = 0; i < as; i++) {

String tmp = strs[i];

strs[i] = strs[len - 1 - i];

strs[len - 1 - i] = tmp;

}

}