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1、完整代码：1. 客户类（class person）：package 客户管理系统;public class Person private int num;private String name;private String address;private String sex;public Person()public Person(int num,String name,String address,String sex)this.num=num;this.name=name;this.address=address;this.sex=sex;public void setNum(int n
2、um)this.num=num;public int getNum()return num;public void setName(String name)this.name=name;public String getName()return name;public void setAddress(String address)this.address=address;public String getAddress()return address;public void setSex(String sex)this.sex=sex;public String getSex()return
3、sex;public String toString() return t+num+t+name+t+address+t+sex;2. 菜单类(class Menu)：package 客户管理系统;import java.util.Scanner;public class Menu Scanner input=new Scanner(System.in);public Menu() public int showMenu() System.out.println(*);System.out.println(客户管理系统);System.out.println(=);System.out.pri
4、ntln(【1】增加);System.out.println(【2】删除);System.out.println(【3】修改);System.out.println(【4】查询);System.out.println(【5】浏览);System.out.println(【6】退出);System.out.println(*);System.out.print(请选择操作：);return input.nextInt();public int subMenu() System.out.println(t【查询客户】);System.out.println(t1按客户编号查询);System.ou
5、t.println(t2按客户姓名查询);System.out.println(t3按地址查询);System.out.println(t4退出);System.out.println(t请选择查询编号);return input.nextInt();3. 实际操作类（class FileOperate ）：package 客户管理系统;import java.io.BufferedReader;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IO
6、Exception;import java.io.PrintWriter;import java.util.ArrayList;import java.util.List;import java.util.Scanner;public class FileOperate private static String INFO=D:/info.dat;File file = new File(INFO);Scanner input=new Scanner(System.in);public FileOperate() if (!file.exists() try file.createNewFil
7、e();catch(IOException e) e.printStackTrace();public List getList() throws NumberFormatException,IOExceptionBufferedReader br=new BufferedReader(new FileReader(file);String msg=null;List list =new ArrayList();while (msg =br.readLine()!=null) String arr=msg.split(t);int num=Integer.parseInt(arr0);Stri
8、ng name =arr1;String address=arr2;String sex=arr3;Person person =new Person(num,name,address,sex);list.add(person);br.close();return list;private void savelist(List list)throws FileNotFoundExceptionPrintWriter pw=new PrintWriter(new File(INFO);for (Person c:list) pw.format(%dt %st %st %st rn,c.getNu
9、m(),c.getName(),c.getAddress(),c.getSex();pw.close(); public int getper(int num) throws NumberFormatException,IOException List list=getList(); for (int i=0;ilist.size();i+) Person per=list.get(i); if(num=per.getNum() return i; return -1; /增加 public void insert() throws NumberFormatException,IOExcept
10、ion System.out.println(请输入编号：); int num=input.nextInt(); int index=getper(num); if (index!=-1) System.out.println(此编号已存在！); elseSystem.out.println(请输入姓名：);String name=input.next();System.out.println(请输入地址：);String address=input.next();System.out.println(请输入性别：);String sex=input.next(); Person person
11、=new Person(num,name,address,sex);List list=getList();list.add(person);savelist(list);System.out.println(新增成功！); /删除 public void delete() throws NumberFormatException,IOException System.out.println(请输入要删除的编号：); int num=input.nextInt(); List list=getList(); boolean flag=false; for(int i=0;ilist.size(
12、);i+) Person per=list.get(i); if(num=per.getNum() showTitle(); System.out.println(per); System.out.println(是否确定删除（Y/N）？); String answer=input.next(); if(Y.equalsIgnoreCase(answer) list.remove(i); savelist(list); System.out.println(删除成功!); flag=true; break; if (!flag) System.out.println(该客户不存在！); /修改 public void update() throws NumberFormatException,IOException shoAll(); System.out.println(请输入编号：n); int num=input.nextI
