快递员功能:存快递，删除快递，修改快递，查看所有快递
普通用户功能:取快递 2. 存快递
3.删除快递
4.修改快递
5.查看所有快递
6.取快递
代码：
1 import java.util.Random;
2 import java.util.Scanner;
3
4 public class Express {
5
6 private static Scanner scanner = new Scanner(System.in);
7 static Express5[] ex = new Express5[10];
8 public static void add() {
9 System.out.println("请输入快递单号：");
10 int tracking0 = scanner.nextInt();
11 System.out.println("请输入公司名称：");
12 String company0 = scanner.next();
13 Express5 e = new Express5();
14 int c = code();
15 e.setCode(c);
16 e.setCompany(company0);
17 e.setNumber(tracking0);
18 for (int i = 0; i < ex.length; i++) {
19 if (ex[i] == null) {
20 ex[i]=e;
21 break;
22 }
23 }
24 System.out.println("快递已存入，取件码是："+c);
25 }
26 public static int code() {
27 Random random = new Random();
28 return random.nextInt(899) + 100;
29 }
30 public static void delete() {
31 System.out.println("请输入要删除的快递单号：");
32 int tracking1 = scanner.nextInt();
33 for(int i = 0;i < ex.length;i ++) {
34 if(ex[i] == null) {
35 System.out.println("未找到快递");
36 break;
37 }else if(ex[i].getNumber() == tracking1) {
38 ex[i] = null;
39 System.out.println("删除成功");
40 break;
41 }
42 }
43 }
44 public static void change() {
45 System.out.println("请输入要修改的快递单号：");
46 int tracking1 = scanner.nextInt();
47 for(int i = 0;i < ex.length;i ++) {
48 Express5 e = new Express5();
49 if(ex[i] == null) {
50 System.out.println("未找到快递");
51 break;
52 }else if(ex[i].getNumber() == tracking1) {
53 System.out.println("请输入新的快递单号：");
54 int tracking3 = scanner.nextInt();
55 System.out.println("请输入新的公司名称：");
56 String company1 = scanner.next();
57 e.setCode(code());
58 e.setNumber(tracking3);
59 e.setCompany(company1);
60 ex[i] = e;
61 System.out.println("修改成功");
62 break;
63 }
64 }
65 }
66
67 public static void find() {
68 System.out.println("所有快递信息如下：");
69 System.out.println("快递单号 公司名称 取件码");
70 for (int i = 0; i < ex.length; i++) {
71 if (ex[i] != null) {
72 System.out.println(ex[i].number + " " + ex[i].company + " " + ex[i].code);
73 }
74 }
75 }
76
77 public static void delete2() {
78 System.out.println("请输入取件码：");
79 int tracking1 = scanner.nextInt();
80 for(int i = 0;i < ex.length;i ++) {
81 if(ex[i] == null) {
82 System.out.println("未找到快递");
83 break;
84 }else if(ex[i].getCode() == tracking1) {
85 ex[i] = null;
86 System.out.println("取件成功");
87 break;
88 }
89 }
90 }
91
92 public static void main(String[] args) {
93 while(true) {
94 System.out.println("=====欢迎使用快递柜=====");
95 System.out.println("请输入您的身份：1-快递员，2-用户");
96 Scanner scanner = new Scanner(System.in);
97 int a = scanner.nextInt();
98 if(a == 1) {
99 System.out.println("请选择操作：1-存快递 2-删除快递 3-修改快递信息 4-查看所有快递");
100 int b = scanner.nextInt();
101 if (b == 1) {
102 add();
103 } else if (b == 2) {
104 delete();
105 } else if (b == 3) {
106 change();
107 } else if (b == 4) {
108 find();
109 } else {
110 System.out.println("输入有误，请重新输入");
111 }
112 }else if(a == 2) {
113 delete2();
114 }
115 }
116
117 }
118 }
119
120
121
122 class Express5 {
123
124 int code;
125 String company;
126 int number;
127
128 public int getCode() {
129 return code;
130 }
131
132 public void setCode(int code) {
133 this.code = code;
134 }
135
136 public String getCompany() {
137 return company;
138 }
139
140 public void setCompany(String company) {
141 this.company = company;
142 }
143
144 public int getNumber() {
145 return number;
146 }
147
148 public void setNumber(int number) {
149 this.number = number;
150 }
151 }