「java图书编号查询」java图书类代码

博主：adminadmin 2023-01-22 18:06:09 317

本篇文章给大家谈谈java图书编号查询，以及java图书类代码对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

采用JAVA设计一个小型图书管理程序（只要增删查改）

使用java语言设计一款小型图书管理系统，能够通过主界面根据关键字查询图书信息，能够添加图书信息和删除过去图书信息

查询图书信息：按名字查询图书 （Java图书管理系统） 按上架日期查询 按种类查询

将图书信息封装成一个类,根据图书对象中保存的信息进行组装sql语句

如:语句初始化为select * from 图书 where 1=1

组装语句

用一个集合(如:columns)保存要用到的字段名

if(null!=书名){

sql语句append( and 书名=? );

集合.add("书名");

}

if(id0){

append( and id=? );

add("id");

}

if(null!=上架日期){

append( and 上架日期=?);

add("上架日期");

}

遍历集合(columns)

for(int i=0;icolumns.size();i++){

setXX(i+1,对象.getXX());

}

//再执行就o了

Java使用面向对象编程思维编写图书管理系统:增加,查询,修改,删除,退出，怎么写？

package com.bms;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

// book对象

public class Book {

private String bId; // 编号

private String bName; // 书名

// getset方法

public String getbId() {

return bId;

}

public void setbId(String bId) {

this.bId = bId;

}

public String getbName() {

return bName;

}

public void setbName(String bName) {

this.bName = bName;

}

//构造方法

public Book() {

}

public Book(String bId, String bName) {

this.bId = bId;

this.bName = bName;

}

/*

* 增加

* */

public static ListBook add(ListBook list) {

Scanner sn = new Scanner(System.in);

System.out.print("请输入编号:");

String bid = sn.next();

System.out.print("请输入名称:");

String bName = sn.next();

Book book = new Book(bid, bName);

for (Book b : list) {

if (b.bId.equals(book.bId)) {

System.out.println("编号重复，请重新输入！");

return list;

}

}

list.add(book);

System.out.println("添加成功！");

return list;

}

/*

* 查询

* */

public static void query(ListBook list) {

System.out.println("编号\t书名");

for (Book b : list) {

System.out.println(b.getbId() + "\t" + b.getbName());

}

}

/*

* 修改

* */

public static void update(ListBook list) {

query(list);

Scanner sc = new Scanner(System.in); // 键盘输入的对象

System.out.print("请输入编号:");

String s = sc.next();

Integer id = null;

for (int i = 0; i list.size(); i++) {

id = list.get(i).getbId().equals(s) ? i : null;

}

if (id == null) {

System.out.println("输入的编号不存在，请重新选择！");

return;

}

System.out.print("请输入新的书名:");

String newName = sc.next();

list.get(id).setbName(newName);

System.out.print("修改成功！");

}

/*

* 删除

* */

public static void del(ListBook list) {

query(list);

Scanner sc = new Scanner(System.in); // 键盘输入的对象

System.out.print("请输入编号:");

String s = sc.next();

for (int i = 0; i list.size(); i++) {

if (list.get(i).getbId().equals(s)) {

list.remove(i);

return;

}

}

System.out.println("输入的编号不存在，请重新选择！");

}

}

/*

* 测试*/

class Test {

public static void main(String[] args) {

ListBook bookList = new ArrayList(); // 存放所有图书的列表

bookList.add(new Book("1", "Java 基础")); // 图书的列表添加一本图书

System.out.print("欢迎进入图书管理系统,");

boolean b = true;

while (b) {

System.out.print("请选择：\n1.增加\n2.查询\n3.修改\n4.删除\n5.退出\n(输入序号):");

Scanner sn = new Scanner(System.in); // 键盘输入的对象

String select = sn.next();

switch (select) {

case "1":

System.out.println("您选择了增加");

Book.add(bookList);

break;

case "2":

System.out.println("您选择了查询:");

Book.query(bookList);

break;

case "3":

System.out.println("您选择了修改");

Book.update(bookList);

break;

case "4":

System.out.println("您选择了删除");

Book.del(bookList);

break;

case "5":

System.out.println("您选择了退出");

b = false;

System.out.println("退出程序！");

break;

default:

System.out.println("输入错误的序号，请重新输入");

break;

}

}

}

}

JAVA版的图书管理系统

送你一份代码，结构大致按照你的需求了，自己增加一些小功能，不会的话请教你同学。

分给我，钱就不用了。

#include string.h

#define FORMAT "\n%-8d%-8d%-7d%-8d%-7d%-8d%-10s%-9s%-9s\n"

#include stdio.h

#include conio.h

#include malloc.h

#define NULL 0

#define N 100

#define LEN sizeof(struct book)

int M;

struct book

{int Enum;

int Cnum;

char name[10];

char author[10];

char publishor[30];

struct date

{int year;

int month;

int day;}time;

int price;

struct book*next;

}go[N];

void print()

{printf("---------------------------------------------------------------------------\n");

printf("Enum Cnum year month day price name author publishor\n");

printf("---------------------------------------------------------------------------\n");

}

void load()

{FILE *fp;

int i;

if((fp=fopen("book_list","rb"))==NULL)

{printf("cannot open file\n");

return;

}

i=0;

while((fread(go[i],sizeof(struct book),1,fp))!=NULL)

{i++;}

M=i;

fclose(fp);

}

void save(int h)

{FILE *fp;

int i;

if ((fp=fopen("BOOK_LIS","wb"))==NULL)

{printf("cannot open file\n");

return;

}

for (i=0;ih;i++)

if(fwrite(go[i],sizeof(struct book),1,fp)!=1)

printf("file write error\n");

fclose(fp);

}

void f1()

{FILE *fp;

int i=0;

fp=fopen("book_list","rb");

print();

while((fread(go[i],sizeof(struct book),1,fp))!=NULL)

{printf(FORMAT,go[i].Enum,go[i].Cnum,go[i].time.year,go[i].time.month,go[i].time.day,go[i].price,go[i].name,go[i].author,go[i].publishor);

i++;

}

fclose(fp);

getch();

}

void f2(int h)

{int i;

printf("please input %d book's information\n",h);

printf("Enum Cnum year month day price name author publishor\n");

for(i=0;ih;i++)

{printf("Enum:\n");

scanf("%d",go[i].Enum);

printf("Cnum:\n");

scanf("%d",go[i].Cnum);

printf("please input year month day\n");

scanf("%d%d%d",go[i].time.year,go[i].time.month,go[i].time.day);

printf("price:\n");

scanf("%d",go[i].price);

printf("name:\n");

scanf("%s",go[i].name);

printf("author:\n");

scanf("%s",go[i].author);

printf("publishor:\n");

scanf("%s",go[i].publishor);

}

save(h);

return;

}

void f3()

{int i;

struct book;

char a[20],b[20],c[20];

load();

printf("please input 'name' or 'author':\n");

scanf("%s",a);

if(strcmp(a,"name")==0)

{printf("please input the book's name:\n");

scanf("%s",b);

for(i=0;iM;i++)

if(strcmp(b,go[i].name)==0)

{print();

printf(FORMAT,go[i].Enum,go[i].Cnum,go[i].time.year,go[i].time.month,go[i].time.day,go[i].price,go[i].name,go[i].author,go[i].publishor);

}

}

else

{printf("please input the book's author:\n");

scanf("%s",c);

for(i=0;iM;i++)

if(strcmp(c,go[i].author)==0)

{print();

printf(FORMAT,go[i].Enum,go[i].Cnum,go[i].time.year,go[i].time.month,go[i].time.day,go[i].price,go[i].name,go[i].author,go[i].publishor);

}

}

return;

}

void f4()

{int i,j,k;

struct book t;

load();

for(i=0;iM;i++)

{k=i;

for(j=i+1;jM;j++)

if(go[k].pricego[j].price)k=j;

t=go[i];go[i]=go[k];go[k]=t;

}

print();

for(i=0;iM;i++)

printf(FORMAT,go[i].Enum,go[i].Cnum,go[i].time.year,go[i].time.month,go[i].time.day,go[i].price,go[i].name,go[i].author,go[i].publishor);

}

void f5()

{FILE *fp;

int i,j,M,flag;

char name[10];

if((fp=fopen("book_list","rb"))==NULL)

{printf("cannot open file\n");

return;

}

printf("\norriginal data:\n");

print();

for(i=0;fread(go[i],sizeof(struct book),1,fp)!=0;i++)

printf(FORMAT,go[i].Enum,go[i].Cnum,go[i].time.year,go[i].time.month,go[i].time.day,go[i].price,go[i].name,go[i].author,go[i].publishor);

M=i;

printf("\n input the deleted name:\n");

scanf("%s",name);

for(flag=1,i=0;flagiM;i++)

{if(strcmp(name,go[i].name)==0)

{for(j=i;jM-1;j++)

{go[j].Enum=go[j+1].Enum;

go[j].Enum=go[j+1].Enum;

strcpy(go[j].name,go[j+1].name);

strcpy(go[j].author,go[j+1].author);

strcpy(go[j].publishor,go[j+1].publishor);

go[j].time.year=go[j+1].time.year;

go[j].time.month=go[j+1].time.month;

go[j].time.day=go[j+1].time.day;

go[j].price=go[j+1].price;

}

flag=0;

}

}

if(!flag)

M=M-1;

else

printf("not found!\n");

printf("\nNow,the content of file:\n");

fp=fopen("book_list","wb");

for(i=0;iM;i++)

fwrite(go[i],sizeof(struct book),1,fp);

fclose(fp);

fp=fopen("book_list","wb");

for(i=0;fread(go[i],sizeof(struct book),1,fp)!=0;i++);

printf(FORMAT,go[i].Enum,go[i].Cnum,go[i].time.year,go[i].time.month,go[i].time.day,go[i].price,go[i].name,go[i].author,go[i].publishor);

fclose(fp);

}

main()

{int i,h;

clrscr();

while(1)

{printf ("\n 1 is a project that can output all information.\n");

printf ("\n 2 is a project that can add any book's information.\n");

printf ("\n 3 is a project that can search information.\n");

printf ("\n 4 is a project that can sort.\n");

printf ("\n 5 is a project that can del.\n");

printf ("\n 6 is a project that can leave.\n");

printf("please input number:1 or 2 or 3 or 4 or 5 or 6\n");

scanf("%d",i);

switch (i)

{case 1:f1();break;

case 2:

{printf ("if you want to add book's information,please input a data:h=");

scanf("%d",h);

f2(h);}break;

case 3:

{f3();getch();}break;

case 4:{f4();getch();}break;

case 5:{f5();getch();}break;

case 6:exit (1);

}

clrscr();}

}

java。在main方法中执行下面的方法，一直打印：命令输入错误，请根据提示输入数字命令！。没查出原因来。

public int CommandIdOrName() {

    System.out.println("请输入命令：1-按照名称查找图书，2-按照图书编号查找图书");

    Scanner input = new Scanner(System. in );

    int i = 0;

    while (true) {

        try {

            String line = input.nextLine().trim();

            i = Integer.parseInt(line);

            System.out.println(i);

            if (i != 1  i != 2) {

                System.out.println("您输入的命令有误！");

                continue;

            }

            input.close();

            break;

        } catch (Exception e) {

            System.out.println("命令输入错误，请根据提示输入数字命令！");

        }

    }

    return i;

}

java图书编号查询的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java图书类代码、java图书编号查询的信息别忘了在本站进行查找喔。

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