代码:
先写个客户类
package jjave_16; /** * 客户类 * */ public class Customer { private String name; private char gender; private int age; private String phone; private String email; 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; } public String toString() { return "Customer [name=" + name + ", gender=" + gender + ", age=" + age + ", phone=" + phone + ", email=" + email + "]"; } }之后就写两个工具类和运行类
package jjave_16; /** * 工具类:操作字符长度输入是否正确 * */ import java.util.Scanner; public class CMUtility { /** * 用于界面菜单的选择,该方法读取键盘,如果用户输入1-5中的任意字符,则方法返回,返回值为用户键入字符 */ private static Scanner scan=new Scanner(System.in);//少了static，下面的方面无法使用 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; } /** * * @param * @param blankReturn * @return */ public static String readKeyBoard(int limit, boolean blankReturn) { String line=" "; for(;;) { line=scan.nextLine(); if(line.length()==0) { if(blankReturn) return line; } if(line.length()<1||line.length()>limit) { System.out.println("输入长度(在大于)" + limit + ")错误,请重新输入:"); //continue; }else break; } return line; } /** * 功能5: 退出判断 */ public static char readConfirmSelection() { char c; for(;;) { String str=readKeyBoard(1,false).toUpperCase(); c=str.charAt(0); if(c!='Y'&&c!='N') { System.out.println("选择错误,请重新输入:"); }else break; } return c; } /** * 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 i) { return readKeyBoard(i,false); } /** * 从键盘读取一个字符,并将其作为方法的返回值 */ public static char readChar() { char c; for (;;) { String str = readKeyBoard(1, false); c = str.charAt(0); if (c == '男' || c == '女') { break; } else { System.out.println("输入错误(只能选择男或女),请重新输入:"); } } return c; } /** * 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 (Exception e) { System.out.println("数字输入错误,请重新输入:"); } } return n; } } package jjave_16; /** * 工具类:操作存储客户的数组增删改查 * */ public class CustomerList { private Customer[] customers; private int total=0; public CustomerList(int index){ customers=new Customer[index]; } /** * 查询所有客户 * 因为需要借助total的值，来确定是数组中的第几个！！ */ public Customer[] getAllCustomers() { Customer[] custs = new Customer[total]; for(int i=0;i<total;i++) { custs[i] = customers[i]; } return custs; } public Customer getCustomer(int limit) { if(limit>0||limit<total) { return customers[limit]; }else return null; } public boolean addCustomer(Customer cust) { /** * for(int i=0;i<index;i++) { * customers[i]=cust; * } * 初步想出的方法，可惜实现很麻烦。。。 */ if(total>customers.length)return false; customers[total++]=cust; return true; } /** * 根据编号删除客户 */ public boolean deleteCustomer(int index) { if(index<0 || index>=total) return false; /** * for里面的条件值得一想。 */ for(int i=index;i<total-1;i++) { customers[i]=customers[i+1]; } customers[--total]=null; return true; } public boolean replaceCustomer(int index,Customer cust) { if(index<0 || index>=total) return false; customers[index]=cust; return true; } } package com.up; /** * 业务类 * */ public class CustomerView { public static void main(String[] args) { CustomerView cView = new CustomerView(); cView.enterMainMenu(); } private CustomerList customers = new CustomerList(10); public CustomerView() { Customer cust = new Customer("张三", '男', 28, "010-56253825", "abc@email.com"); customers.addCustomer(cust); } public void enterMainMenu() { boolean loopFlag = true; do { 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.println(" 请选择(1-5):"); char key = CMUtility.readMenuSelection(); switch (key) { 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 yn = CMUtility.readConfirmSelection(); if (yn == 'Y') { loopFlag = false; } break; } } while (loopFlag); } private void addNewCustomer() { System.out.println("------------------------添加客户----------------------"); System.out.println("姓名:"); String name = CMUtility.readString(4); 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(15); System.out.println("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----------------------"); } } private void modifyCustomer() { System.out.println("------------------------修改客户----------------------"); int index = 0; Customer cust = null; for (;;) { System.out.println("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.println("姓名("+cust.getName()+"):"); String name = CMUtility.readString(4,cust.getName()); System.out.println("性别("+cust.getGender()+"):"); char gender = CMUtility.readChar(); System.out.println("年龄("+cust.getAge()+"):"); int age = CMUtility.readInt(); System.out.println("电话("+cust.getPhone()+"):"); String phone = CMUtility.readString(15,cust.getPhone()); System.out.println("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------------------"); } } private void deleteCustomer() { System.out.println("------------------------删除客户----------------------"); int index = 0; Customer cust = null; for (;;) { System.out.println("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.println("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 listAllCustomer() { 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" + custs[i].getPhone() + "\t" + custs[i].getEmail()); } } } }暂时先用数组实现客户的保存，当然里面使用到了高内聚低耦合的设计概念。
