import java.util.*;public class MainTest {    public static void main(String[] args) {        String hex = toHex(12500);        if (hex.equalsIgnoreCase("30D4")) {            System.out.println("测试通过");        } else {            System.out.println("测试失败");        }    }    static String toHex(int n) {        String res = "";        Deque<String> deque = new LinkedList<>();        List<String> hdict = List.of("0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F");        int nl = 0;        while (n != 0) {            nl = n & 0xF;            n = n >> 4;            deque.push(hdict.get(nl));        }        String res1 = "";        try {            while ((res1 = deque.pop()) != null) {                res = res + res1;            }        } catch (NoSuchElementException e) {        }        return res;    }}