Java 练习(客户信息管理软件)

客户信息管理软件

模拟实现基于文本界面的《客户信息管理软件》。
该软件由以下三个模块组成

  • CustomerView 为主模块,负责菜单的显示和处理用户操作
  • CustomerList 为 Customer 对象的管理模块,内部用数组管理一组 Customer 对象,并提供相应的添加、修改、删除和遍历方法,供 CustomerView 调用
  • Customer 为实体对象,用来封装客户信息

该软件能够实现对客户对象的插入、修改和删除(用数组实现),并能够打印客户明细表。项目采用分级菜单方式。
主菜单如下:

项目结构

com.klvchen.p2.bean 包

Customer.java

package com.klvchen.p2.bean;

/**
 * Customer为实体对象,用来封装客户信息
 * @author Administrator
 *
 */

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 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;
	}

	
	
}

com.klvchen.p2.service 包

CustomerList.java

package com.klvchen.p2.service;

import com.klvchen.p2.bean.Customer;

/**
 * CustomerList 为 Customer对象的管理模块
 * @author Administrator
 *
 */

public class CustomerList {
	private Customer[] customers;  // 用来保存客户对象的数组
	private int total;         // 记录已保存客户对象的数量

	// 初始化 customers 数组的构造器,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
	public boolean addCustomer(Customer customer) {
		if(total >= customers.length) {
			return false;
		}
		
		customers[total] = customer;
		total++;
		return true;
		
	}
	
	// 修改指定索引位置上的客户
	public boolean replaceCustomer(int index, Customer cust) {
		if(index < 0 || index >= total) {
			return false;
		}
		
		customers[index] = cust;
		return true;
	}
	
	// 删除指定索引位置上的客户
	public boolean deleteCustomer(int index) {
		if(index < 0 || index >= total) {
			return false;
		}
		
		for(int i = index; i < total -1; 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
	public Customer[] getAllCustomers() {
		Customer[] custs = new Customer[total];
		for(int i = 0; i < total; i++) {
			custs[i] = customers[i];
		}
		return custs;
	}
	
	// 获取指定索引位置上的客户
	public Customer getCustomer(int index) {
		if(index < 0 || index >= total) {
			return null;
		}
		
		return customers[index];
	}
	
	// 获取存储的客户数量
	public int getTotal() {
		return total;
	}
	
}

com.klvchen.p2.ui 包

CustomerView.java

package com.klvchen.p2.ui;

import com.klvchen.p2.bean.Customer;
import com.klvchen.p2.service.CustomerList;
import com.klvchen.p2.util.CMUtility;

/**
 * CustomerView为主模块,负责菜单的显示和处理用户操作
 * @author Administrator
 *
 */
public class CustomerView {
	private CustomerList customerList = new CustomerList(10);
	
	public CustomerView() {
		Customer customer = new Customer("陈先生", '男', 23, "135353535", "kl@gmail.com");
		customerList.addCustomer(customer);
	}
	
	// 显示《客户信息管理软件》
	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;
				}
			}
		}
		
	}
	
	public void addNewCustomer() {
		System.out.println("--------------------添加客户--------------------");
		System.out.println("姓名: ");
		String name = CMUtility.readString(10);
		System.out.println("性别: ");
		char gender = CMUtility.readChar();
		System.out.println("年龄: ");
		int age = CMUtility.readInt();
		System.out.println("电话: ");
		String phone = CMUtility.readString(13);
		System.out.println("邮箱: ");
		String email = CMUtility.readString(30);
		
		//将上述数据封装到对象中
		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("--------------------客户目录已满,添加失败--------------------");
		}
		
		
	}
	public void modifyCustomer() {
		System.out.println("--------------------修改客户--------------------");
		Customer cust;
		int number;
		for(;;) {
			System.out.println("请选择修改客户编号(-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 { //找到了相应编号的客户
				break;
			}
			
		}
		
		//修改客户信息
		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(13, cust.getPhone());
		
		System.out.print("邮箱(" + cust.getEmail() + "):");
		String email = CMUtility.readString(30, 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("--------------------修改失败--------------------");
		}
		
		
	}
	public void deleteCustomer() {
		System.out.println("--------------------删除客户--------------------");
		int number;
		for(;;) {
			System.out.println("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;
			}
		}
		
		//找到了指定的客户
		System.out.println("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("--------------------删除失败--------------------");
			}
		}else {
			return;
		}
		
	}
	public 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\t电话\t\t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" + cust.getPhone() + "\t" + cust.getEmail());
			}
		}
		
		System.out.println("--------------------客户列表完成--------------------");

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

com.klvchen.p2.util 包

CMUtility.java

package com.klvchen.p2.util;

import java.util.*;
/**
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,而无需考虑具体的功能实现细节。
*/
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,如果用户键入’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。
	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过2位的整数,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 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。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;
    }
}

测试结果:



posted @ 2021-02-08 17:20  klvchen  阅读(316)  评论(0编辑  收藏  举报