Java 尚硅谷-项目二客户信息管理软件

工具类

import java.util.Scanner;

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，如果用户输入1-5，则返回值为用户输入
	*/
	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.println("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
	 * 如果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过2位数的整数，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.println("数字输入错误，请重新输入");
			}
		}
		return n;
	}
	/**
	 * 从键盘读取一个长度不超过2位数的整数，作为方法的返回值
	 * 如果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.println("数字输入错误，请重新输入");
			}
		}
		return n;
	}
	/**
	 * 从键盘读取一个长度不超过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过limit的字符串，并将其作为方法的返回值
	 * 如果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，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.println("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.println("输入长度（不大于"+limit+"）错误，请重新输入");
				continue;
			}
			break;
		}
		return line;
	}
}

Model

/**
 * 
 * @Description Customer为实体对象，用来封装客户信息
 * @author Jiaxue Li
 * @Email:jl492@uowmail.edu.au
 * @date 2021年5月25日 下午11:23:45
 */
public class Customer {
	private String name;
	private char gender;
	private int age;
	private String phone;
	private String 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;
	}

	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;
	}

}

Controller-service

import com.project2.bean.Customer;

/**
 * 
 * @Description CustomerList为Customer对象的管理模块，
 *              内部用数组管理一组Customer对象，并提供响应的增删改查和遍历方法，供CustomerView调用
 * @author Jiaxue Li
 * @Email:jl492@uowmail.edu.au
 * @date 2021年5月25日 下午11:26:39
 */
public class CustomerList {
	private Customer[] customers;
	private int total = 0;
	/**
	 * 用来初始化customers数组的构造器
	 * @param totalCustomer：指定数组的长度
	 */
	public CustomerList(int totalCustomer) {
		customers=new Customer[totalCustomer];
	}
	/**
	 * 将指定的客户添加到数组中
	 * @param customer
	 * @return true：添加成功，false：添加失败
	 */
	public boolean addCustomer(Customer customer) {
		if(total>=customers.length) {
			return false;
		}else {
//			customers[total]=customer;
//			total++;
			//或者
			customers[total++]=customer;
			return true;
		}
	}
	/**
	 * 修改指定索引位置上的客户信息
	 * @param index
	 * @param cust
	 * @return true：修改成功，false：修改失败
	 */
	public boolean replaceCustomer(int index, Customer cust) {
		if(index<0||index>=total) {
			return false;
		}
		customers[index]=cust;
		return true;
	}
	/**
	 * 删除指定索引位置的客户
	 * @param index
	 * @return true：删除成功，false：删除失败
	 */
	public boolean deleteCustomer(int index) {
		if(index<0||index>=total) {
			return false;
		}
		for(int i=index;i<total--;i++) {
			customers[i]=customers[i+1];
		}
		//最后有数据的元素需要置空
		customers[total-1]=null;
		total--;
		return true;
	}
	/**
	 * 获取所有的客户信息
	 * @return
	 */
	public Customer[] getAllCustomers() {
		Customer[] custs=new Customer[total];
		for(int i=0;i<total;i++) {
			//复制的是地址值
			custs[i]=customers[i];
		}
		return custs;
	}
	/**
	 * 获取指定索引上的客户
	 * @param index
	 * @return 如果找到了元素则返回，没找到则返回null
	 */
	public Customer getCustomer(int index) {
		if(index<0||index>=total) {
			return null;
		}
		return customers[index];
	}
	/**
	 * 获取存储的客户数量
	 * @return
	 */
	public int getTotal() {
		return total;
	}
}

View

import com.project2.bean.Customer;
import com.project2.service.CustomerList;
import com.project2.util.CMUtility;

/**
 * 
 * @Description CustomerView为主模块，负责菜单的显示和处理用户操作
 * @author Jiaxue Li
 * @Email:jl492@uowmail.edu.au
 * @date 2021年5月25日 下午11:29:21
 */
public class CustomerView {
	private CustomerList customerList = new CustomerList(10);

	public CustomerView() {
		Customer customer = new Customer("wang", 'n', 23, "040313712", "gfjshh@gamil.com");
		customerList.addCustomer(customer);
	}

	public void enterMainMenu() {
		boolean isFlag = true;
		while (isFlag) {
			System.out.println("n-----------------客户信息管理软件-----------------n");
			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n");
			System.out.print("                   请选择(1-5)：");
			char menu = CMUtility.readMenuSelection();
			switch (menu) {
			case '1':
				addNewCustomer();
				break;
			case '2':
				modifyCustomer();
				break;
			case '3':
				deleteCustomer();
				break;
			case '4':
				listAllCustomer();
				break;
			case '5':
				System.out.println("确认是否退出？（Y/N）");
				char isExit = CMUtility.readConfirmSelection();
				if (isExit == 'Y') {
					isFlag = false;
					System.out.println("再见");
				}
			}
		}
	}

	// 添加客户
	private void addNewCustomer() {
		System.out.println("---------------------添加客户---------------------");
		System.out.print("姓名");
		String name = CMUtility.readString(30);
		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(20);
		System.out.print("邮箱");
		String email = CMUtility.readString(20);
		// 将上述变量封装到对象中
		Customer customer = new Customer(name, gender, age, phone, email);
		boolean isSuccess = customerList.addCustomer(customer);
		if (isSuccess) {
			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---------------------");
		Customer cust;
		int number;
		for (;;) {
			System.out.print("请选择待修改客户编号(-1退出)：");
			number = CMUtility.readInt();
			if (number == -1) {
				return;
			}
			cust = customerList.getCustomer(number - 1);
			if (cust == null) {
				System.out.println("无法找到指定客户！");
			} else {// 找到了客户
				break;
			}
		}
		System.out.print("姓名(" + cust.getName() + "):");
		String name = CMUtility.readString(10, 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());
		Customer newcust = new Customer(name, gender, age, phone, email);
		boolean isreplaced = customerList.replaceCustomer(number - 1, newcust);
		if (isreplaced) {
			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 number;
		for (;;) {
			System.out.print("请选择待删除客户编号(-1退出)：");
			number = CMUtility.readInt();
			if (number == -1) {
				return;
			}
			Customer customer = customerList.getCustomer(number - 1);
			if (customer == 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 isDelete = CMUtility.readConfirmSelection();
		if (isDelete == 'Y') {
			boolean deleteSuccess = customerList.deleteCustomer(number - 1);
			if (deleteSuccess) {
				System.out.println("---------------------删除完成---------------------");
			} else {
				System.out.println("----------无法找到指定客户,删除失败--------------");
			}
		}
	}

	// 显示客户列表
	private void listAllCustomer() {
		System.out.println("---------------------------客户列表---------------------------");
		int total = customerList.getTotal();
		if (total == 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tt电话tt邮箱");
			Customer[] custs = customerList.getAllCustomers();
			for (int i = 0; i < custs.length; i++) {
				Customer cust = custs[i];
				System.out.println((i + 1) + "t" + cust.getName() + "t" + cust.getGender() + "t" + cust.getAge()
						+ "t" + "t" + cust.getPhone() + "t" + cust.getEmail());

			}
		}
		System.out.println("-------------------------客户列表完成-------------------------");
	}

	public static void main(String[] args) {
		CustomerView view = new CustomerView();
		view.enterMainMenu();
	}
}

需要注意导包的名称是正确的，这些代码里导包的名字不可用

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