麻烦帮改个程序

public class hello {
    public static void main(String[] args) {
        int[] arr = new int[]{8,2,1,0,3};
        int[] index = new int[] {2,0,3,2,4,0,1,3,2,3,3};
        String tel = "";
        for (int i : index)
            tel += arr[i];
        System.out.println("联系方式："+tel);
    }
}