思路:1,本程序写的是客户管理,有多级选择,字符输入,数字输入,等要求,且题目要求必需是数组形式存入数据,因而需要很多构造方法,封装。数组在增添元素时候不如集合那么便利,必需要构造多个包来封装变量,方法。2,发明一个Customer类,里面寄存着着customer的各种元素,private修饰,提供set/get方法,无参,有参构造
3,发明一个customer类,本类提供custermor[]custermor和total变量,total控制数组长度,本类是以customer为对象的管理模块,内部使用一组数组管理对象。并提供相应的删除,添加,修改,遍历的方法。
详细三部分关系如下图:
4,由题目提供了一些根本方法,封装在CMutility类中。- //本类封装了各种根本元素,供后面调用
- public class Customer {
- private String name;//客户姓名
- private char gender; //性别
- private int age; //年龄
- private String phone; //电话号码
- private String email; //电子邮箱
- public Customer() {
- }
- public Customer(String name, char gender, int age, String phone, String email) {
- this.name = name;
- this.gender = gender;
- this.age = age;
- this.phone = phone;
- this.email = email;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public char getGender() {
- return gender;
- }
- public void setGender(char gender) {
- this.gender = gender;
- }
- public int getAge() {
- return age;
- }
- public void setAge(int age) {
- this.age = age;
- }
- public String getPhone() {
- return phone;
- }
- public void setPhone(String phone) {
- this.phone = phone;
- }
- public String getEmail() {
- return email;
- }
- public void setEmail(String email) {
- this.email = email;
- }
- }
复制代码- /**题目提供的CMutility方法
- CMUtility工具类:
- 将不同的功能封装为方法,就是可以直接通过调用方法使用它的功能,而无需考虑详细的功能实现细节。
- */
- public class CMUtility {
- private static Scanner scanner = new Scanner(System.in);
- /**
- 用于界面菜单的选择。该方法读取键盘,假设用户键入’1’-’5’中的任意字符,则方法返回。返回值为用户键入字符。
- */
- public static char readMenuSelection() {
- char c;
- for (; ; ) {
- String str = readKeyBoard(1, false);
- c = str.charAt(0);
- if (c != '1' && c != '2' &&
- c != '3' && c != '4' && c != '5') {
- System.out.print("选择错误,请重新输入:");
- } else break;
- }
- return c;
- }
- /**
- 从键盘读取一个字符,并将其作为方法的返回值。
- */
- public static char readChar() {
- String str = readKeyBoard(1, false);
- return str.charAt(0);
- }
- /**
- 从键盘读取一个字符,并将其作为方法的返回值。
- 假设用户不输入字符而直接回车,方法将以defaultValue 作为返回值。
- */
- public static char readChar(char defaultValue) {
- String str = readKeyBoard(1, true);
- return (str.length() == 0) ? defaultValue : str.charAt(0);
- }
- /**
- 从键盘读取一个长度不超越2位的整数,并将其作为方法的返回值。
- */
- public static int readInt() {
- int n;
- for (; ; ) {
- String str = readKeyBoard(2, false);
- try {
- n = Integer.parseInt(str);
- break;
- } catch (NumberFormatException e) {
- System.out.print("数字输入错误,请重新输入:");
- }
- }
- return n;
- }
- /**
- 从键盘读取一个长度不超越2位的整数,并将其作为方法的返回值。
- 假设用户不输入字符而直接回车,方法将以defaultValue 作为返回值。
- */
- public static int readInt(int defaultValue) {
- int n;
- for (; ; ) {
- String str = readKeyBoard(2, true);
- if (str.equals("")) {
- return defaultValue;
- }
- try {
- n = Integer.parseInt(str);
- break;
- } catch (NumberFormatException e) {
- System.out.print("数字输入错误,请重新输入:");
- }
- }
- return n;
- }
- /**
- 从键盘读取一个长度不超越limit的字符串,并将其作为方法的返回值。
- */
- public static String readString(int limit) {
- return readKeyBoard(limit, false);
- }
- /**
- 从键盘读取一个长度不超越limit的字符串,并将其作为方法的返回值。
- 假设用户不输入字符而直接回车,方法将以defaultValue 作为返回值。
- */
- public static String readString(int limit, String defaultValue) {
- String str = readKeyBoard(limit, true);
- return str.equals("")? defaultValue : str;
- }
- /**
- 用于确认选择的输入。该方法从键盘读取‘Y’或’N’,并将其作为方法的返回值。
- */
- public static char readConfirmSelection() {
- char c;
- for (; ; ) {
- String str = readKeyBoard(1, false).toUpperCase();
- c = str.charAt(0);
- if (c == 'Y' || c == 'N') {
- break;
- } else {
- System.out.print("选择错误,请重新输入:");
- }
- }
- return c;
- }
- private static String readKeyBoard(int limit, boolean blankReturn) {
- String line = "";
- while (scanner.hasNextLine()) {
- line = scanner.nextLine();
- if (line.length() == 0) {
- if (blankReturn) return line;
- else continue;
- }
- if (line.length() < 1 || line.length() > limit) {
- System.out.print("输入长度(不大于" + limit + ")错误,请重新输入:");
- continue;
- }
- break;
- }
- return line;
- }
- }
复制代码 customerlist:customerview:- //创建最大包含10个客户对象的CustomerList对象,供以下各成员方法使用。
- private CustomerList customers = new CustomerList(10);
- public CustomerView() {
- Customer cust = new Customer("张三", '男', 30, "010-56253825",
- "abc@email.com");
- customers.addCustomer(cust);
- }
- //用处:显示主菜单,响应用户输入,根据用户操作分别调用其他相应的成员方法(如addNewCustomer),以完成客户信息处置。
- public void enterMainMenu() {
- for(;;) {
- System.out
- .println("-----------------客户信息管理软件-----------------");
- System.out.println(" 1 添 加 客 户");
- System.out.println(" 2 修 改 客 户");
- System.out.println(" 3 删 除 客 户");
- System.out.println(" 4 客 户 列 表");
- System.out.println(" 5 退 出");
- System.out.print(" 请选择(1-5):");
- char key = CMUtility.readMenuSelection();
- System.out.println();
- switch (key) {
- case '1':
- addNewCustomer();
- break;
- case '2':
- modifyCustomer();
- break;
- case '3':
- deleteCustomer();
- break;
- case '4':
- listAllCustomers();
- break;
- case '5':
- System.out.print("确认是否退出(Y/N):");
- char yn = CMUtility.readConfirmSelection();
- if (yn == 'Y') {
- System.exit(0);
- }else {
- break;
- }
- }
- }
- }
- //添加客户
- private void addNewCustomer() {
- System.out.println("---------------------添加客户---------------------");
- System.out.print("姓名:");
- String name = CMUtility.readString(4);
- System.out.print("性别:");
- char gender = CMUtility.readChar();
- System.out.print("年龄:");
- int age = CMUtility.readInt();
- System.out.print("电话:");
- String phone = CMUtility.readString(15);
- System.out.print("邮箱:");
- String email = CMUtility.readString(15);
- Customer cust = new Customer(name, gender, age, phone, email);
- boolean flag = customers.addCustomer(cust);
- if (flag) {
- System.out
- .println("---------------------添加完成---------------------");
- } else {
- System.out.println("----------------记录已满,无法添加-----------------");
- }
- }
- //修改客户
- private void modifyCustomer() {
- System.out.println("---------------------修改客户---------------------");
- int index = 0;
- Customer cust = null;
- for (;;) {
- System.out.print("请选择待修改客户编号(-1退出):");
- index = CMUtility.readInt();
- if (index == -1) {
- return;
- }
- cust = customers.getCustomer(index - 1);
- if (cust == null) {
- System.out.println("无法找到指定客户!");
- } else
- break;
- }
- System.out.print("姓名(" + cust.getName() + "):");
- String name = CMUtility.readString(4, cust.getName());
- System.out.print("性别(" + cust.getGender() + "):");
- char gender = CMUtility.readChar(cust.getGender());
- System.out.print("年龄(" + cust.getAge() + "):");
- int age = CMUtility.readInt(cust.getAge());
- System.out.print("电话(" + cust.getPhone() + "):");
- String phone = CMUtility.readString(15, cust.getPhone());
- System.out.print("邮箱(" + cust.getEmail() + "):");
- String email = CMUtility.readString(15, cust.getEmail());
- cust = new Customer(name, gender, age, phone, email);
- boolean flag = customers.replaceCustomer(index - 1, cust);
- if (flag) {
- System.out
- .println("---------------------修改完成---------------------");
- } else {
- System.out.println("----------无法找到指定客户,修改失败--------------");
- }
- }
- //删除客户
- private void deleteCustomer() {
- System.out.println("---------------------删除客户---------------------");
- int index = 0;
- Customer cust = null;
- for (;;) {
- System.out.print("请选择待删除客户编号(-1退出):");
- index = CMUtility.readInt();
- if (index == -1) {
- return;
- }
- cust = customers.getCustomer(index - 1);
- if (cust == null) {
- System.out.println("无法找到指定客户!");
- } else
- break;
- }
- System.out.print("确认是否删除(Y/N):");
- char yn = CMUtility.readConfirmSelection();
- if (yn == 'N')
- return;
- boolean flag = customers.deleteCustomer(index - 1);
- if (flag) {
- System.out
- .println("---------------------删除完成---------------------");
- } else {
- System.out.println("----------无法找到指定客户,删除失败--------------");
- }
- }
- private void listAllCustomers() {
- System.out.println("---------------------------客户列表---------------------------");
- Customer[] custs = customers.getAllCustomers();
- if (custs.length == 0) {
- System.out.println("没有客户记录!");
- } else {
- System.out.println("编号\t姓名\t性别\t年龄\t\t电话\t\t邮箱");
- for (int i = 0; i < custs.length; i++) {
- System.out.println(i + 1 + "\t" + custs[i].getName() + "\t" + custs[i].getGender() + "\t" + custs[i].getAge() + "\t\t" + custs[i].getPhone() + "\t" + custs[i].getEmail());
- }
- }
- System.out.println("-------------------------客户列表完成-------------------------");
- }
- //用处:创建CustomerView实例,并调用 enterMainMenu()方法以执行程序。
- public static void main(String[] args) {
- CustomerView cView = new CustomerView();
- cView.enterMainMenu();
- }
- }
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