用java编写一个 图书馆图书借阅管理系统

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给你修改了三个地方：

1.borrowBooks方法中，将System.out.println("你要借吗？")改为：

System.out.println("你要借吗闷前？输入1表示借，其他数字表示不借。")

保证输入的时候输入的数字，否则会报裂隐出异常。

2.borrowBooks方法中，将self[score] = all[9]改为：self[score] = all[i]

如果是all[9]，那么就始终是最后一本书籍信息了。

3.have方法中，你是想将所借的书籍信息都打印出来。修改的比较多，下面注释代码是原来的。

void have(Books[] self) {

// for (int i = 0i <2i++) {

// self[i].showBookInfo()

// }

for (int i = 0i <3i++) {

if(self[i]!=null)

self[i].showBookInfo()

}

}

****************** 附上所有代码：*************************

import java.util.Scanner

public class TestBook {

public static void main(String[] args) {

Books all[] = new Books[10]

Books self[] = new Books[3]

all[0] = new Books("java", 1, "12345", "tom", 34.0f, "人民出版社")

all[1] = new Books("c", 2, "12346", "tnn", 31.0f, "人民出版社")

all[2] = new Books("c++", 3, "12445", "mm", 35.0f, "人民出版社")

all[3] = new Books("c#", 4, "12365", "tt", 38.0f, "人民出版社")

all[4] = new Books("j2se", 5, "13345", "tosm", 31.1f, "人民出版社")

all[5] = new Books("j2ee", 6, "18345", "ttm", 32.0f, "人民出版社")

all[6] = new Books("jsp", 7, "12335", "cc", 33.0f, "人民出版社")

all[7] = new Books("net", 8, "12341", "bb", 36.0f, "人民出版社")

all[8] = new Books("ip", 9, "12343", "aa", 37.0f, "人民出版社")

all[9] = new Books("tcp", 10, "22345", "jj", 39.0f, "人民出版社")

Readers r = new Readers("xiaoming", 101, "1", 3)

r.searchAllBooks(all)

r.borrowBooks(all, self)

r.have(self)

r.give(all, self)

}

}

class Readers {

Scanner scan = new Scanner(System.in)

String names

int nums

String classes

int grade

int score = 0

// Books self[]=new Books[3]

Readers(String n, int u, String c, int g) {

names = n

nums = u

classes = c

grade = g

}

void searchAllBooks(Books[] all) {/肆罩厅/ 查书

for (int i = 0i <10i++)

all[i].showBookInfo()

// self[score]=all[0]

}

void give(Books[] all, Books[] self) {// 还书

System.out.println("请输入您要还的书的书号")

int n = scan.nextInt()

for (int i = 0i <10i++) {

if (n == all[i].num) {

for (int j = 0j <3j++) {

if (self[j] == all[i]) {

self[j] = null

System.out.println("还书成功")

}

}

}

}

}

void have(Books[] self) {

// for (int i = 0i <2i++) {

// self[i].showBookInfo()

// }

for (int i = 0i <3i++) {

if(self[i]!=null)

self[i].showBookInfo()

}

}

void giveMoney() {

}

void borrowBooks(Books[] all, Books[] self) {

System.out.println("请输入您要查找的书名：")

String n = scan.next()

int i

for (i = 0i <10i++) {

if (n.equals(all[i].name)) {

all[i].showBookInfo()

break

}

}

//System.out.println("你要借吗？")

System.out.println("你要借吗？输入1表示借，其他数字表示不借。")

int j

j = scan.nextInt()

if (j == 1) {

System.out.println("借阅成功")

//self[score] = all[9]

self[score] = all[i]

score += 1

}

if (score <4) {

System.out.println("您还可以借阅" + (3 - score) + "本")

} else {

System.out.println("对不起，一个人只能借3本")

}

}

}

class Books {

String name

int num

String ISBN

String writer

float price

String publisher

Books(String n, int u, String i, String w, float p, String l) {

name = n

num = u

ISBN = i

writer = w

price = p

publisher = l

}

void showBookInfo() {

System.out.println("**************************")

System.out.println("书名：" + name)

System.out.println("索书号：" + num)

System.out.println("ISBN号：" + ISBN)

System.out.println("价格：" + price)

System.out.println("出版社：" + publisher)

System.out.println("**************************")

}

}

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1.先用jdbc连接数据库，这个网上好多你去凳薯仔搜下就有

2.借书还书就是对某张表的更新 *** 作，你借书还书的时候枣汪可以得到该书的一个id，这时，你通过这个id从数据库中找到所对应的数据，更改书得库存量即可。

自己动手做手绝一遍，其实不难的，加油！

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