int[] arr=new int[]{8,2,9,0,3}; int[] index = new int[]{2,0,3,2,4,0,7,3,2,3,3}; String ? ?number = "";for(int i : index){ //請(qǐng)問(wèn)一下這一句是什么意思呀？ tel+=arr[i]; } System.out.println(number);