. . . . Java 源代码public class loaduser public String user; public String password; boolean b1; loaduser(String s1,String s2) user=s1; password=s2; void load() System.out.println( 书店管理销售系统); System.out.println(*); System.out.println( 1、登录系统); System.out.println( 2、退出系统); System.out.println(*); System.out.println(请选择：); int m; Scanner s=new Scanner(System.in); m=s.nextInt(); if(m=1) for(int i=0;i3;i+) System.out.println(请输入账户名和密码); String s3,s4; Scanner ss=new Scanner(System.in); s3=s.next(); s4=s.next(); if(user.equals(s3)&password.equals(s4) b1=true ; else b1=false; if(i=0&b1=false)System.out.println(用户名或密码输入错误一次，还有两次机会!); if(i=1&b1=false)System.out.println(用户名或密码输入错误两次，还有一次机会!); if(i=2&b1=false)System.out.println(三次输入错误，退出系统!);System.exit(0); if(b1=true) System.out.println(登录成功！); break; if(m=2)System.exit(0); package manger;import java.util.ArrayList;import java.util.Scanner;import manger.vip;import System.menu;public class vipmanger static ArrayList vipgroup=new ArrayList();public vipmanger() vipgroup.add(new vip(001,王芳,100); vipgroup.add(new vip(002,李娜,60); vipgroup.add(new vip(003,杨丽,50); vipgroup.add(new vip(004,孙洁,150); vipgroup.add(new vip(005,肖青,300); static void addd() System.out.println(请一次输入编号，姓名，积分); String S1,S2; int A; Scanner s=new Scanner(System.in); S1=s.next(); S2=s.next(); A=s.nextInt(); vip v1=new vip (S1,S2,A); vipgroup.add(v1); static void delete() System.out.println(请输入要求删除的会员编号：); String s; Scanner me=new Scanner (System.in); s=me.next(); boolean b1=true; for(int i=0;ivipgroup.size();i+) if(s.equals(vipgroup.get(i).ID) vipgroup.remove(i); b1=false; if(b1)System.out.println(查无此会员！); static void correct() System.out.println(请输入要修改信息的会员编号：); String sss; Scanner s=new Scanner(System.in); sss=s.next(); boolean b1=true; for(int i=0;ivipgroup.size();i+) if(sss.equals(vipgroup.get(i).ID) b1=false; System.out.println(请输入新的姓名和积分：); String ss1; Scanner s7=new Scanner(System.in); ss1=s7.next(); vipgroup.get(i).name=ss1; int b; Scanner s8=new Scanner(System.in); b=s8.nextInt(); vipgroup.get(i).score=b; if(b1=true)System.out.println(查无此会员！); static void select() System.out.println(请输入要查询的会员编号：); String s; Scanner me=new Scanner(System.in); s=me.next(); boolean b1=true ; for(int i=0;ivipgroup.size();i+) if (s.equals(vipgroup.get(i).ID)System.out.println(vipgroup.get(i).ID+ +vipgroup.get(i).name+ +vipgroup.get(i).score); b1=false ; if(b1=true)System.out.println(查无此会员！); static void show() for(int i=0;ivipgroup.size();i+) System.out.println(vipgroup.get(i).ID+ +vipgroup.get(i).name+ +vipgroup.get(i).score); public static void exchange(String s1,int a,int b) boolean b1=true; for(int i=0;ivipgroup.size();i+) if(s1.equals(vipgroup.get(i).ID) if(vipgroup.get(i).score(a*b)System.out.println(积分不足，不能兑换！); else vipgroup.get(i).score-=a*b; b1=false; if(b1=true)System.out.println(查无此会员，不能兑换！); public static void shop(String s1,int a,int b) boolean b1=true; for( int i=0;ivipgroup.size();i+)if(s1.equals(vipgroup.get(i).ID)vipgroup.get(i).score+=a*b; b1=false; if(b1=true)System.out.println(查无此会员,不能购买!); public static boolean start() menu m=new menu(); m.vip(); int x; Scanner me= new Scanner(System.in); x=me.nextInt(); switch(x) case 1:show();break; case 2:delete(); break; case 3:addd();break; case 4:correct();break; case 5:select();break; case 6:return false; return true; public class book public String number; public String name; public int price; public int jf; book(String s1,String s2,int a,int b) number=s1; name=s2; price=a; jf=b; package manger;impo