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。
