string tel = "";
for (int i : index) {
tel+= arr[i];
}
system.out.println("联系方式:"+tel);
求解
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);