如何用Java代码实现图书管理系统

这篇文章主要介绍“如何用Java代码实现图书管理系统”，在日常操作中，相信很多人在如何用Java代码实现图书管理系统问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”如何用Java代码实现图书管理系统”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

文件位置

AllBook

package tushuguan;import java.io.Serializable;import java.util.Scanner;//------------------------图书信息的代码--------------------------@SuppressWarnings("serial")class Book implements Serializable{ //图书类        String BookNo;              //编号        String BookName;            //书名        String BookAuthor;          //作者        int zk;                              //是否在库        int cs;                              //借阅次数        showInfo info=new showInfo();        //借阅信息日常显示    public Book(){                           //定义构造方法，初始化数据项            BookNo="";            BookName="";            BookAuthor="";                 zk=0;            cs=0;            }        public String getBookNo(){            return BookNo;        }        public String getBookName(){            return BookName;        }        public String getBookAuthor(){            return BookAuthor;        }           //````````````````````````新增图书信息``````````````````````````    public void inputBook(){                 //输入单个图书        @SuppressWarnings({"resource" })        Scanner in2=new Scanner(System.in);          System.out.print("请输入图书编号：");        String s;        s=in2.nextLine();        int a;        a=AllBook.queryBooByBookNo(s);        while(a!=-1){                            //判断是否已有相同编号的图书存在        System.out.print("该书籍已存在，请重新输入!\n");        System.out.print("请输入图书编号：");        s=in2.nextLine();        a=AllBook.queryBooByBookNo(s);        }        BookNo=s;        System.out.print("请输入图书名称：");        BookName=in2.nextLine();         System.out.print("请输入图书作者：");        BookAuthor=in2.nextLine();        zk=1;        }              public void showBook(){                        //显示单个图书信息    System.out.print("图书编号:"+BookNo+"\n图书名称："+BookName+"\n图书作者："+BookAuthor+"\n借阅次数:"+cs);            if(zk==1)                System.out.print("\n该图书：在库\n");            else                System.out.print("\n该图书： 不在库\n");           }                }           @SuppressWarnings("serial")public class AllBook  implements Serializable{      //所有图书集合类         static Book []Book=new Book[20];       //定义一个能存储20个图书的数组对象        static int index=0;                                                  //用于存储当前已有图书的数量    public  AllBook(){                     //初始化所有单元的图书信息；        for(int i=0;i<Book.length;i++){            Book[i]=new Book();            }    }    //---------------输入多个图书信息--------------------    public void inputAB(){                              int a=1;        for(int i=index;i<Book.length;i++){            if(a==1){             System.out.print("下面录入第"+(index+1)+"本图书的信息:\n");            Book[index].inputBook();             index++;             System.out.print("继续添加请按1，停止添加请按0：");                int b;                @SuppressWarnings("resource")             Scanner in1=new Scanner(System.in);                b=in1.nextInt();               switch(b){               case 0: a=0;break;               default: break;                        }                    }         }                    }          //`````````````````````````浏览多个图书信息````````````````````````    public void showAllBook(){//显示所有图书信息        System.out.print("共有"+index+"本书");            for(int i=0;i<index;i++){                System.out.print("\n下面输出第"+(i+1)+"本书的信息：\n");            Book[i].showBook();                           }            if(index==0){                System.out.print("没有图书信息！");            }        }    //**************************************    public void queryByBookNo(){                 //1.按编号查询            String a;            @SuppressWarnings("resource")            Scanner in2=new Scanner(System.in);            System.out.print("请输入要查询的图书编号：");            a=in2.nextLine();            if(queryBooByBookNo(a)!=-1){            System.out.print("该图书信息为：\n");            Book[queryBooByBookNo(a)].showBook();            }            else                                 System.out.print("该图书不存在！");                   }    public static int queryBooByBookNo(String s){//按编号查询，s为查询的图书编号;若找到，则返回该信息的位置，否则返回-1            int flag=-1;            for(int i=0;i<index;i++){                if(s.equals(Book[i].BookNo)){                    flag=i;break;                }            }    return flag;        }    //****************************************            public void queryByBookName(){               //2.按名称查询            String a;            @SuppressWarnings("resource")            Scanner in1=new Scanner(System.in);            System.out.print("请输入要查询的图书名称：");            a=in1.nextLine();            if(queryBooByBookName(a)!=-1){            System.out.print("该图书信息为：\n");            Book[queryBooByBookName(a)].showBook();            }            else                                 System.out.print("该图书不存在！");                                  }    public int queryBooByBookName(String s){      //按名称查询，s为查询的图书名称;若找到，则返回该信息的位置，否则返回-1            int flag=-1;            for(int i=0;i<index;i++){                if(s.equals(Book[i].BookName)){                    flag=i;break;                }            }            return flag;        }    //*************************************    public void queryByBookAuthor(){                 //3.按作者查询            String a;            @SuppressWarnings("resource")        Scanner in1=new Scanner(System.in);            System.out.print("请输入要查询的图书作者：");            a=in1.nextLine();            if(queryBooByBookAuthor(a)!=-1){             System.out.print("该图书信息为：\n");            Book[queryBooByBookAuthor(a)].showBook();            }            else                                System.out.print("该图书不存在！");                                }    public int queryBooByBookAuthor(String s){      //按作者查询，s为查询的图书作者;若找到，则返回该信息的位置，否则返回-1            int flag=-1;            for(int i=0;i<index;i++){                if(s.equalsIgnoreCase(Book[i].BookAuthor)){                    flag=i;break;                }            }            return flag;        }            //```````````````````````删除图书信息``````````````````````````    public void deleteByBookNo(){                  //删除指定编号的图书信息   String b;   @SuppressWarnings("resource")   Scanner in2=new Scanner(System.in);   System.out.print("请输入要删除图书的编号");   b=in2.nextLine();    if (queryBooByBookNo(b)!=-1){                    //判断该图书是否存在                  for(int i=queryBooByBookNo(b);i<index-1;i++){                  Book[i]=Book[i+1];                          }                   System.out.print("删除成功！");                  index--;                  }    else        System.out.print("该图书不存在！");           }    //```````````````````````修改图书信息``````````````````````````        @SuppressWarnings("resource")    public void reviseByBookNo(){                  // 按编号查找该图书并修改图书内容        String b;        int n;    Scanner in2=new Scanner(System.in);    Scanner in3=new Scanner(System.in);    System.out.print("请输入要修改的图书编号");    b=in3.nextLine();                        if(queryBooByBookNo(b)!=-1){         //判断该图书是否存在                        int i=queryBooByBookNo(b);                        System.out.println("请选择要修改的图书信息：");                        System.out.println("1-修改图书编号");                        System.out.println("2-修改图书名称");                        System.out.println("3-修改图书作者");                        System.out.println("4-修改所有信息");                         n=in2.nextInt();                         while(n<0||n>4){                                System.out.print("该数字无效，请重新选择：");                                n=in2.nextInt();}                switch(n){                case 1:{                                                     System.out.println("请输入修改后的图书编号：");                         Book[i].BookNo=in3.nextLine();    break;                         }                case 2:{                        System.out.println("请输入修改后的图书名称：");                        Book[i].BookName=in3.nextLine();break;                         }                case 3:{                       System.out.println("请输入修改后的图书作者：");                       Book[i].BookAuthor=in3.nextLine();break;                         }                case 4:{                       System.out.println("请输入修改后的图书编号、图书名称 、图书作者：");                       System.out.println("请输入修改后的图书编号：");                       Book[i].BookNo=in3.nextLine();                       System.out.println("请输入修改后的图书名称：");                       Book[i].BookName=in3.nextLine();                       System.out.println("请输入修改后的图书作者：");                       Book[i].BookAuthor=in3.nextLine();                }                         } System.out.print("修改成功!");                      }                    else                    System.out.print("该图书不存在！");                }                               }

AllBorrow

package tushuguan;import java.io.Serializable;import java.util.Scanner;class showInfo {                 //定义一个借阅信息显示类       String lendtime;            //借书日期       String returntime;          //还书日期       String lendStuNo;           //借书学生编号       String lendStuName;         //借书学生姓名       String lendStuClass;        //借书学生班级       public showInfo(){          //定义构造方法，初始化数据项               lendtime="";                           returntime="";           lendStuNo="";           lendStuName="";           lendStuClass="";       }}@SuppressWarnings("serial")class Borrow implements Serializable{//借阅类     static int BoCs;                //最大的借阅次数     String StudentNo;     String BookNo;    public Borrow(){          //定义构造方法，初始化数据项                         BoCs=0;             StudentNo="";             BookNo="";            }}@SuppressWarnings("serial")class AllBorrow  implements Serializable{//所有借阅类            //-----------------显示借阅信息---------------         public void showlendInfo(String BookNo){          int a=AllBook.queryBooByBookNo(BookNo);      //找到该编号对应的图书下标赋值给a          System.out.print("\n该图书的借阅信息为：");                   System.out.print("\n该借书学生学号为："+AllBook.Book[a].info.lendStuNo);          System.out.print("\n该借书学生姓名为："+AllBook.Book[a].info.lendStuName);          System.out.print("\n该借书学生班级为："+AllBook.Book[a].info.lendStuClass);          System.out.print("\n该图书的借出日期："+AllBook.Book[a].info.lendtime);              }    //---------------显示归还信息------------------    public void showlendReturn(String BookNo){          int a=AllBook.queryBooByBookNo(BookNo);      //找到该编号对应的图书下标赋值给a          System.out.print("\n该图书的归还信息为：");                   System.out.print("\n该借书学生学号为："+AllBook.Book[a].info.lendStuNo);          System.out.print("\n该借书学生姓名为："+AllBook.Book[a].info.lendStuName);          System.out.print("\n该借书学生班级为："+AllBook.Book[a].info.lendStuClass);          System.out.print("\n该图书的借出日期："+AllBook.Book[a].info.lendtime);          System.out.print("\n该图书的归还日期："+AllBook.Book[a].info.returntime);     }    //----------------------多本图书借阅----------------        @SuppressWarnings("resource")    public void Alllend(){         Scanner in1=new  Scanner(System.in);         Scanner in2=new Scanner(System.in);         int a=0,b=0;         String StudentNo,BookNo,d;         int c=1;         System.out.print("请输入你的学号：");            StudentNo=in1.nextLine();                      b=AllStudent.queryStuByStudentNo(StudentNo);            if(b!=-1){                 //判断该学生是否存在                       System.out.print("登录成功!\n");                       while(c==1){                         System.out.print("请查询要借阅的图书\n");                                     System.out.print("请输入该书编号：");                                 BookNo=in1.nextLine();                         a=AllBook.queryBooByBookNo(BookNo);                         if(a!=-1){   //判断图书是否存在                          if(AllBook.Book[a].zk==1){        //判断图书是否在库                               AllBook.Book[a].showBook();                              System.out.print("\n该图书在库,请填写借阅信息：");                          AllBook.Book[a].zk=0;      //借出图书，将图书的在库信息修改为不在库                          AllBook.Book[a].cs++;      //借出图书，该图书借阅次数加一                          AllBook.Book[a].info.lendStuNo=AllStudent.Student[b].StudentNo;                          AllBook.Book[a].info.lendStuName=AllStudent.Student[b].StudentName;                          AllBook.Book[a].info.lendStuClass=AllStudent.Student[b].StudentClass;                          System.out.print("\n请填写借出日期(xxxxxxxx)：");                          d=in1.nextLine();                          while(d.length()!=8){     //判断日期格式是否正确                              System.out.print("日期格式错误，请重新输入8个字符的借书日期（如20180101）");                              System.out.print("\n请重新填写归还日期：");                              d=in1.nextLine();                        }                         AllBook.Book[a].info.lendtime=d;                         System.out.print("借阅成功！");                                                   }                          else                             System.out.print("图书不在库,借阅失败!");                         }                         else                              System.out.print("图书不存在,借阅失败!");                                                          System.out.print("\n是否继续借阅：1-是，0-否");                              c=in2.nextInt();                    switch(c){                        case 0: c=0;break;                       default: break;                               }                 }            }            else              System.out.print("该学生信息不存在!\n");                  }         //---------------归还图书管理（单本）---------    @SuppressWarnings("resource")    public void returnBook(){         Scanner in1=new Scanner(System.in);         Scanner in2=new Scanner(System.in);         System.out.print("请输入归还图书的编号：");         String BookNo,b;         BookNo=in1.nextLine();         int a=AllBook.queryBooByBookNo(BookNo);         if(a!=-1){          if(AllBook.Book[a].zk==0){                          System.out.print("\n请填写归还日期(xxxxxxxx)：");             b=in2.nextLine();            if(b.length()!=8){   //判断日期格式             while (b.length()!=8){                          System.out.print("归还日期出错！");                   System.out.print("\n请重新填写归还日期，例如20180101：");                  AllBook.Book[a].info.returntime=in2.nextLine();            }}                    else              while(AllBook.Book[a].info.returntime.compareTo(AllBook.Book[a].info.lendtime)<=0){              System.out.print("归还时间不对，请输入不小于借阅日期的日期");              System.out.print("\n请重新填写归还日期：");              AllBook.Book[a].info.returntime=in2.nextLine();            }            AllBook.Book[a].zk=1;              System.out.print("归还成功！");               showlendReturn(BookNo);}          else              System.out.print("该图书在库不需要归还！");         }         else             System.out.print("不存在该图书!");              }            //--------------------多本图书归还-------------------    @SuppressWarnings("resource")    public void Allreturn(){     int c=1;     Scanner in1=new  Scanner(System.in);          while(c==1){            returnBook();             System.out.print("\n\n是否继续归还：1-是，0-否");                      c=in1.nextInt();            switch(c){             case 0: c=0;break;             case 1: break;            default: break;                    }             }          }        //----------------按借阅次数查询-------------------    public int  findBoCs(){  //找到最大的借阅次数     for(int i=0;i<AllBook.index;i++){         if(Borrow.BoCs<AllBook.Book[i].cs){             Borrow.BoCs=AllBook.Book[i].cs;         }              }return Borrow.BoCs;}    public void findByTj(){   //按借阅次数查询     int a= findBoCs();     int c=0;    System.out.print("最大借阅次数为"+a+",请输入要查询的借阅次数:");    @SuppressWarnings("resource")    Scanner in1=new Scanner(System.in);    int b;    b=in1.nextInt();        if(b<=a){         System.out.print("\n借阅次数为"+b+"的图书信息如下:\n");         for(int  i=0;i<AllBook.index;i++){          if(AllBook.Book[i].cs==b){            AllBook.Book[i].showBook();             c++;             }          }           if(c==0){              System.out.print("\n不存在借阅次数为"+b+"的图书");             }          }    else    System.out.print("该借阅次数超过最大借阅次数!");}        //-------------------显示所有在库图书----------------    public void showzkBook(){        int c=0;        System.out.print("所有在库的图书信息为：\n");        for(int  i=0;i<AllBook.index;i++){            if(AllBook.Book[i].zk==1){                AllBook.Book[i].showBook();                c++;            }        }        if(c==0){            System.out.print("无在库图书！");        }    }    //-------------------显示所有不在库图书----------------    public void showbzkBook(){        int c=0;        System.out.print("所有不在库的图书信息为：\n");        for(int  i=0;i<AllBook.index;i++){            if(AllBook.Book[i].zk==0){                AllBook.Book[i].showBook();                c++;            }        }        if(c==0){        System.out.print("无不在库图书！");        }    }      //----------------------图书查询管理----------------------    public void findbook(){     @SuppressWarnings("resource")    Scanner in=new Scanner(System.in);     String b;     System.out.print("请输入要查找图书的编号：\n");     b=in.nextLine();     int a=AllBook.queryBooByBookNo(b);    if(a!=-1){      if(AllBook.Book[a].zk==1)                       AllBook.Book[a].showBook();          else          {          AllBook.Book[a].showBook();          showlendInfo(b);   }         }    else         System.out.print("图书不存在!");     }}

AllStudent

package tushuguan;import java.io.Serializable;import java.util.Scanner;    @SuppressWarnings("serial")class Student implements Serializable{ //学生类           String StudentNo;    //学号           String StudentName;  //书名           String StudentClass; //班级                    public Student(){//定义构造方法，初始化数据项               StudentNo="";               StudentName="";               StudentClass="";                        }           public String getStudentNo(){               return StudentNo;           }           public String getStudentName(){               return StudentName;           }           public String getStudentClass(){               return StudentClass;           }                     //````````````````````````新增学生信息``````````````````````````       public void inputStudent(){//输入单个学生               @SuppressWarnings("resource")            Scanner in2=new Scanner(System.in);               System.out.print("请输入学生学号：");               String s;               s=in2.nextLine();               int a;            a=AllStudent.queryStuByStudentNo(s);            while(a!=-1){         //判断是否已经存在该学号的学生             System.out.print("该学生已存在，请重新输入!\n");             System.out.print("请输入学生学号：");             s=in2.nextLine();             a=AllStudent.queryStuByStudentNo(s);            }            StudentNo=s;               System.out.print("请输入学生名称：");               StudentName=in2.nextLine();               System.out.print("请输入学生班级：");               StudentClass=in2.nextLine();                         }    public void showStudent(){//显示单个学生信息               System.out.print("学生学号:"+StudentNo+"\n学生名称："+StudentName+"\n学生班级："+StudentClass);                  }               }           @SuppressWarnings("serial")public class AllStudent implements Serializable{                      //所有学生集合类            static Student []Student=new Student[20];                     //定义一个能存储20个学生的数组对象           static int index=0;                                                  //用于存储当前已有学生的数量           public  AllStudent(){                                        //初始化所有单元的学生信息；            for(int i=0;i<Student.length;i++){               Student[i]=new Student();               }           }       //----------------输入多个学生信息---------------       public void inputAS(){            int a=1;               for(int i=index;i<Student.length;i++){               if(a==1){                  System.out.print("下面录入第"+(index+1)+"个学生的信息:\n");                Student[i].inputStudent();                index++;                System.out.print("继续添加请按1，停止添加请按0：");                   int b;                   @SuppressWarnings("resource")                Scanner in1=new Scanner(System.in);                   b=in1.nextInt();                   switch(b){                   case 0: a=0;break;                   default: break;                               }                       }            }                      }           //`````````````````````````浏览学生信息````````````````````````       public void showAllStudent(){//显示所有学生信息               for(int i=0;i<index;i++){                   System.out.print("\n下面输出第"+(i+1)+"个学生的信息：\n");                Student[i].showStudent();                             }               if(index==0){                   System.out.print("没有学生信息!");               }           }            @SuppressWarnings("resource")    public void queryByStudentNo(){                 //1.按学号查询               String a;               int c;               Scanner in1=new Scanner(System.in);               System.out.print("请输入要查询的学生编号：");               a=in1.nextLine();               c=queryStuByStudentNo(a);               if(c!=-1){                System.out.print("该学生信息为：\n");             Student[queryStuByStudentNo(a)].showStudent();               }               else                                     System.out.print("该学生不存在！");                                  }       public static int queryStuByStudentNo(String s){//按学号查询，s为查询的学生学号;若找到，则返回该信息的位置，否则返回-1               int flag=-1;               for(int i=0;i<index;i++){                   if(s.equalsIgnoreCase(Student[i].StudentNo)){                       flag=i;break;                   }               }               return flag;           }    //*******************************************           @SuppressWarnings("resource")    public void queryByStudentName(){                 //2.按名字查询               String a;               Scanner in1=new Scanner(System.in);               System.out.print("请输入要查询的学生名字：");               a=in1.nextLine();               if(queryStuByStudentName(a)!=-1){                System.out.print("该学生信息为：\n");              Student[queryStuByStudentName(a)].showStudent();               }               else                               System.out.print("该学生不存在！");                                     }       public int queryStuByStudentName(String s){       //按名字查询，s为查询的学生名字;若找到，则返回该信息的位置，否则返回-1               int flag=-1;               for(int i=0;i<index;i++){                   if(s.equalsIgnoreCase(Student[i].StudentName)){                       flag=i;break;                   }                   else                       continue;               }               return flag;           }       //*******************************************           @SuppressWarnings("resource")    public void queryByStudentClass(){                 //3.按班级查询               String a;               Scanner in1=new Scanner(System.in);               System.out.print("请输入要查询的学生班级：");               a=in1.nextLine();               if(queryStuByStudentClass(a)!=-1){                System.out.print("该学生信息为：\n");              Student[queryStuByStudentClass(a)].showStudent();               }               else                                    System.out.print("该学生不存在！");                                     }       public int queryStuByStudentClass(String s){         //按班级查询，s为查询的学生班级;若找到，则返回该信息的位置，否则返回-1               int flag=-1;               for(int i=0;i<index;i++){                   if(s.equalsIgnoreCase(Student[i].StudentClass)){                       flag=i;break;                   }                   else                       continue;               }               return flag;           }                //```````````````````````删除学生信息``````````````````````````        @SuppressWarnings("resource")    public void deleteByStudentNo(){                  //删除指定学号的学生信息         String b;         Scanner in2=new Scanner(System.in);         System.out.print("请输入要删除学生的学号");         b=in2.nextLine();          if (queryStuByStudentNo(b)!=-1){                        for(int i=queryStuByStudentNo(b);i<index;i++){                        Student[i]=Student[i+1];                                              }                          index--;                        System.out.print("删除成功！");                        }          else              System.out.print("该学生不存在！");                }             //```````````````````````修改学生信息``````````````````````````     @SuppressWarnings("resource")    public void reviseByStudentNo(){          // 按编号查找该图书并修改图书内容            String b;            int n;         Scanner in2=new Scanner(System.in);         Scanner in3=new Scanner(System.in);         System.out.print("请输入要修改的学生编号：");         b=in2.nextLine();                              if(queryStuByStudentNo(b)!=-1){                                  int i=queryStuByStudentNo(b);                          System.out.println("请选择要修改的学生信息：");                          System.out.println("1-修改学生学号");                          System.out.println("2-修改学生姓名");                          System.out.println("3-修改学生班级");                          System.out.println("4-修改所有信息");                           n=in2.nextInt();                          while(n<0||n>4){                              System.out.print("该数字无效，请重新选择：");                              n=in2.nextInt();}                           switch(n){                  case 1:{                                                        System.out.println("请输入修改后的学生学号：");                          Student[i].StudentNo=in3.nextLine();    break;                           }                  case 2:{                          System.out.println("请输入修改后的学生姓名：");                          Student[i].StudentName=in3.nextLine();break;                           }                  case 3:{                          System.out.println("请输入修改后的学生班级：");                          Student[i].StudentClass=in3.nextLine();break;                              }                  case 4:{                          System.out.println("请输入修改后的学生学号、姓名、班级：");                          System.out.println("请输入修改后的学生学号：");                          Student[i].StudentNo=in3.nextLine();                          System.out.println("请输入修改后的学生姓名：");                        Student[i].StudentName=in3.nextLine();                        System.out.println("请输入修改后的学生班级：");                          Student[i].StudentClass=in3.nextLine();                  }                           } System.out.print("修改成功!");                        }                      else                      System.out.print("该学生不存在！");                  }                                }

Tushu

package tushuguan;import java.io.Serializable;import java.util.Scanner;        @SuppressWarnings("unused")class Menu{//菜单类        AllBook Book=new AllBook();        AllStudent Student=new AllStudent();        AllBorrow Borrow= new AllBorrow();                 public void showMenu(){//主菜单部分               System.out.println("******系部图书成绩管理系统*******");               System.out.println("**     1.图书信息管理                   **");               System.out.println("**     2.学生信息管理                   **");               System.out.println("**     3.借阅信息管理                   **");               System.out.println("**     0.退出总管理系统                **");               System.out.println("***************************");               System.out.println("请选择: ");               selectMenu();           }           public void selectMenu(){//选择主菜单部分               @SuppressWarnings("resource")            Scanner in1=new Scanner(System.in);               int a;               a=in1.nextInt();               while(a<0||a>3){                   System.out.print("该数字无效，请重新选择:");                   a=in1.nextInt();               }               switch (a){               case 1:{showMBook();break;}               case 2:{showMStudent();break;}               case 3:{showMBorrow();break;}             case 0:{System.out.print("******感谢您的使用！******");}               }           }           //-------------------------图书信息管理目录-----------------------------            public void showMBook(){//图书信息管理目录                    System.out.println("\n*******图书信息管理目录******");               System.out.println("**       1.新增                            **");               System.out.println("**       2.查询                            **");               System.out.println("**       3.删除                            **");              System.out.println("**       4.浏览                            **");              System.out.println("**       5.修改                            **");               System.out.println("**       6.返回上一菜单              **");               System.out.println("**       0.退出总管理系统          **");               System.out.println("************************************");               System.out.println("请选择：");               selectMBook();           }           public void selectMBook(){//选择图书目录               @SuppressWarnings("resource")            Scanner in1=new Scanner(System.in);               int b;               b=in1.nextInt();               while(b>6||b<0){                   System.out.print("该数字无效，请重新选择:");                   b=in1.nextInt();               }               switch (b){               case 1:{                                   Book.inputAB();                  //新增图书信息                                   System.out.print("\n完成图书信息新增操作.\n");                                   showMBook();break;}               case 2:{                                                                                                              findBook();                 //查找图书信息                                   System.out.print("\n完成图书信息查询操作.\n");                                   showMBook();break;}                          case 3:{                                                                               Book.deleteByBookNo();           //删除图书信息                                  System.out.print("\n完成图书信息删除操作.\n");                                  showMBook();break;}               case 4:{                                                                                Book.showAllBook();              //浏览图书信息                                                                     System.out.print("\n完成图书信息浏览操作.\n");                                  showMBook();break;}               case 5:{                                                                               Book.reviseByBookNo();        //修改图书信息                                  System.out.print("\n完成图书信息修改操作.\n");                                  showMBook();break;}               case 6:{                                                                              showMenu();}                         //返回上一界面                              case 0:{           System.out.print("\n******感谢您的使用！******");System.exit(0);}                 }              }      //`````````````````````````查询图书信息````````````````````````        public void findBook(){               System.out.print("\n请选择查找图书方式：\n");               System.out.println("*******查找图书方式******");               System.out.println("**       1.按图书编号查找                 **");               System.out.println("**       2.按图书名称查找                 **");               System.out.println("**       3.按图书作者查找                 **");               System.out.println("**       0.返回上一菜单                     **");               @SuppressWarnings("resource")              Scanner in2=new Scanner(System.in);                       int c;                      c=in2.nextInt();                      while(c<0||c>3){                             System.out.print("该数字无效，请重新选择：");                             c=in2.nextInt();}                      switch(c){                      case 1:{                          Book.queryByBookNo();break;        //按编号查询图书信息                                     }                      case 2:{                          Book.queryByBookName(); break;     //按书名查询图书信息                                    }                      case 3:{                          Book.queryByBookAuthor(); break;   //按作者查询图书信息                                     }                      case 0:{                                showMBook();}}            }      //-------------------------学生信息管理目录-----------------------------        public void showMStudent(){//学生信息管理目录                  System.out.println("\n*******学生信息管理目录******");           System.out.println("**       1.新增                        **");           System.out.println("**       2.查询                        **");           System.out.println("**       3.删除                        **");          System.out.println("**       4.浏览                        **");          System.out.println("**       5.修改                        **");           System.out.println("**       6.返回上一菜单          **");           System.out.println("**       0.退出总管理系统       **");           System.out.println("*************************");           System.out.println("请选择：");           selectMStudent();       }         public void selectMStudent(){//选择学生目录           @SuppressWarnings("resource")        Scanner in1=new Scanner(System.in);           int b;           b=in1.nextInt();                while(b<0||b>6){               System.out.print("该数字无效，请重新选择：");               b=in1.nextInt();           }           switch (b){           case 1:{                             Student.inputAS();               //新增学生信息                             System.out.print("\n完成学生信息新增操作\n");                             showMStudent();break;}           case 2:{                             findStudent();           //查找学生信息                             System.out.print("\n完成学生信息查询操作\n");                             showMStudent();break;}                  case 3:{                                                                                                                    Student.deleteByStudentNo();       //删除学生信息                                                                              System.out.print("\n完成学生信息删除操作\n");                             showMStudent();break;}           case 4:{                             Student.showAllStudent();     //浏览学生信息                                                                        System.out.print("\n完成学生信息浏览操作\n");                             showMStudent();break;}           case 5:{                                                                                                                                 Student.reviseByStudentNo();//修改图书信息                             System.out.print("\n完成学生信息修改操作\n");                          showMStudent();break;}           case 6:{                             showMenu();    }                      //返回主菜单                      case 0:{          System.out.print("\n******感谢您的使用！******");System.exit(0);}              }         }        //`````````````````````````查询学生信息````````````````````````           @SuppressWarnings("resource")    public void findStudent(){                  System.out.print("\n请选择查找学生方式：\n");               System.out.println("***********查找学生方式**********");               System.out.println("**       1.按学生学号查找                 **");               System.out.println("**       2.按学生名称查找                 **");               System.out.println("**       3.按学生班级查找                 **");               System.out.println("**       0.返回上一菜单                      **");               Scanner in2=new Scanner(System.in);               int c;               c=in2.nextInt();               while(c<0||c>3){                   System.out.print("该数字无效，请重新选择：");                   c=in2.nextInt();}      switch(c){                  case 1:{                        Student.queryByStudentNo();break;      //按学号查询学生信息                                    }                  case 2:{                        Student.queryByStudentName(); break;   //按姓名查询学生信息                                   }                  case 3:{                       Student.queryByStudentClass(); break;   //按班级查询学生信息                                   }                  case 0:{ showMStudent();}               }                              }      //-------------------------图书借阅信息管理目录-----------------------------        public void showMBorrow(){        System.out.println("\n*******借阅图书信息管理目录*****");        System.out.println("**       1.图书借阅管理                **");        System.out.println("**       2.图书归还管理                **");                   System.out.println("**       3.图书查询管理                **");           System.out.println("**       4.统计查询管理                **");                   System.out.println("**       5.返回上一菜单                **");           System.out.println("**       0.退出总管理系统             **");           System.out.println("**********************************");           System.out.println("请选择：");           selectMBorrow();       }        public void selectMBorrow(){//选择图书目录           @SuppressWarnings("resource")        Scanner in1=new Scanner(System.in);           int b;           b=in1.nextInt();           while(b<0||b>5){               System.out.print("该数字无效，请重新选择：");               b=in1.nextInt();}           switch(b){           case 1:{                    Borrow.Alllend();          //图书借阅管理                   System.out.print("\n完成图书借阅操作\n");                showMBorrow();break;                                       }           case 2:{                   Borrow.Allreturn();       //图书归还管理                System.out.print("\n完成图书借阅操作\n");                showMBorrow();break;                 }                     case 3:{                   Borrow.findbook();       //图书查询管理                   System.out.print("\n完成图书查询操作\n");                showMBorrow();break;             }           case 4:{               TjfindBook();     //统计查询管理               System.out.print("\n完成图书统计查询操作\n");               showMBorrow();break;              }           case 5:{   showMenu();      }     //返回主菜单           case 0:{   System.out.print("\n******感谢您的使用！******");System.exit(0);}                     }        }    //-------------------统计查询管理--------------------------    public void TjfindBook(){     System.out.println("请选择统计查询的方式：\n");     System.out.println("1-按借阅次数查询");     System.out.println("2-按在库与否查询");     System.out.println("0-返回上一菜单  ");     @SuppressWarnings("resource")          Scanner in1 =new Scanner(System.in);     int a;     a=in1.nextInt();     while(a<0||a>3){            System.out.print("该数字无效，请重新选择：");            a=in1.nextInt();}     switch(a){     case 1:{                   Borrow.findByTj();      //按借阅次数查询                   System.out.print("\n完成统计查询图书操作\n");                   showMBorrow();break;                                 }     case 2:{                   findByzk();            //按是否在库查询                   System.out.print("\n完成统计查询图书操作\n");                   showMBorrow();break;                                  }     case 0:{      showMBorrow();}  //返回上一菜单     }}    //--------------按是否在库查询图书----------------------    public void findByzk(){             System.out.print("请选择在库模式查询：\n");             System.out.println("1-显示所有在库图书");             System.out.println("2-显示所有不在库图书");             System.out.println("0-返回上一菜单");                   @SuppressWarnings("resource")             Scanner in1 =new Scanner(System.in);             int a;             a=in1.nextInt();             while(a<0||a>3){                    System.out.print("该数字无效，请重新选择：");                    a=in1.nextInt();}             switch(a){             case 1:{                  Borrow.showzkBook();break;  //显示所有在库图书             }             case 2:{                  Borrow.showbzkBook();break;  //显示所有不在库图书             }             case 0:{ showMBorrow();}             }        }}public class Tushu{    public static void main(String []args){        Menu menu =new Menu();        menu.showMenu();    }}

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