这里给出一个编译错误的程序，虽然是编译错误，不过我也不太想改过来了。只是因为我用了走超出范围的类型ArrayList<Phone>，这里的Phone是我自定义的一个内部类。
完整程序如下，大家可以用数组改过来：
1 import java.util.ArrayList;
2 import java.util.Scanner;
3
4 public class Main {
5
6 public static void main(String[] args) {
7 Scanner in = new Scanner(System.in);
8 int n = in.nextInt();
9 for (int i = 0; i < n; i++) {
10 int price = in.nextInt();
11 int count = in.nextInt();
12 ArrayList<Phone> phones = new ArrayList<>();
13 for (int j = 0; j < count; j++) {
14 Phone phone = new Phone();
15 phone.setmPhoneId(in.nextInt());
16 phone.setmPrice(in.nextInt());
17 phone.setmSalesVolume(in.nextInt());
18 phone.setmAverageScore(in.nextInt());
19 phones.add(phone);
20 }
21
22 phones = getPhones(phones);
23 for (int j = 0; j < phones.size(); j++) {
24 if (phones.get(j).getmPrice() <= price) {
25 System.out.println(phones.get(j).getmPhoneId());
26 }
27 }
28 }
29 }
30
31 private static ArrayList<Phone> getPhones(ArrayList<Phone> ps) {
32 for (int i = 0; i < ps.size(); i++) {
33 for (int j = i + 1; j < ps.size(); j++) {
34 if (ps.get(i).getmSalesVolume() < ps.get(j).getmSalesVolume()) {
35 // 交换
36 Phone phone = new Phone();
37 phone = ps.get(i);
38 ps.set(i, ps.get(j));
39 ps.set(j, phone);
40 } else if(ps.get(i).getmSalesVolume() == ps.get(j).getmSalesVolume()){
41 // 其它判断
42 if (ps.get(i).getmAverageScore() < ps.get(j).getmAverageScore()) {
43 // 交换
44 Phone phone = new Phone();
45 phone = ps.get(i);
46 ps.set(i, ps.get(j));
47 ps.set(j, phone);
48 } else if (ps.get(i).getmAverageScore() == ps.get(j).getmAverageScore()) {
49 // 其它判断
50 if (ps.get(i).getmPrice() > ps.get(j).getmPrice()) {
51 // 交换
52 Phone phone = new Phone();
53 phone = ps.get(i);
54 ps.set(i, ps.get(j));
55 ps.set(j, phone);
56 } else {
57 // do nothing
58 }
59 } else {
60 // do nothing
61 }
62 } else {
63 // do nothing
64 }
65 }
66 }
67
68 return ps;
69 }
70
71 public static class Phone {
72 int mPhoneId;
73 int mPrice;
74 int mSalesVolume;
75 int mAverageScore;
76 public int getmPhoneId() {
77 return mPhoneId;
78 }
79 public void setmPhoneId(int mPhoneId) {
80 this.mPhoneId = mPhoneId;
81 }
82 public int getmPrice() {
83 return mPrice;
84 }
85 public void setmPrice(int mPrice) {
86 this.mPrice = mPrice;
87 }
88 public int getmSalesVolume() {
89 return mSalesVolume;
90 }
91 public void setmSalesVolume(int mSalesVolume) {
92 this.mSalesVolume = mSalesVolume;
93 }
94 public int getmAverageScore() {
95 return mAverageScore;
96 }
97 public void setmAverageScore(int mAverageScore) {
98 this.mAverageScore = mAverageScore;
99 }
100 }
101 }
-----------------------------------------------------------数组的方法--------------------------------------------------------------------
1 import java.util.Scanner;
2
3 public class Main {
4
5 public static void main(String[] args) {
6 Scanner in = new Scanner(System.in);
7 int n = in.nextInt();
8 for (int i = 0; i < n; i++) {
9 int price = in.nextInt();
10 int count = in.nextInt();
11 int[][] phones = new int[count][4];
12 for (int j = 0; j < count; j++) {
13 for (int k = 0; k < phones[j].length; k++) {
14 phones[j][k] = in.nextInt();
15 }
16 }
17 phones = getPhones(phones, count);
18 for (int j = 0; j < count; j++) {
19 // System.out.println(phones[j][0] + ", " + phones[j][1] + ", " + phones[j][2] + ", " + phones[j][3]);
20 if (phones[j][1] <= price) {
21 System.out.println(phones[j][0]);
22 }
23 }
24 }
25 }
26
27 private static int[][] getPhones(int[][] ps, int count) {
28 for (int i = 0; i < count; i++) {
29 for (int j = i + 1; j < count; j++) {
30 if (ps[i][2] < ps[j][2]) {
31 // 交换
32 for (int k = 0; k < ps[i].length; k++) {
33 int temp = ps[i][k];
34 ps[i][k] = ps[j][k];
35 ps[j][k] = temp;
36
37 }
38 } else if(ps[i][2] == ps[j][2]){
39 // 其它判断
40 if (ps[i][3] < ps[j][3]) {
41 // 交换
42 for (int k = 0; k < ps[i].length; k++) {
43 int temp = ps[i][k];
44 ps[i][k] = ps[j][k];
45 ps[j][k] = temp;
46
47 }
48 } else if (ps[i][3] == ps[j][3]) {
49 // 其它判断
50 if (ps[i][1] > ps[j][1]) {
51 // 交换
52 for (int k = 0; k < ps[i].length; k++) {
53 int temp = ps[i][k];
54 ps[i][k] = ps[j][k];
55 ps[j][k] = temp;
56
57 }
58 } else {
59 // do nothing
60 }
61 } else {
62 // do nothing
63 }
64 } else {
65 // do nothing
66 }
67 }
68 }
69
70 return ps;
71 }
72 }
时间： 2024-10-28 21:36:37