java实现图书检索系统（基于java的图书借阅管理系统）

java模拟实现图书检索系统 (基础版)，供大家参考，具体内容如下

练习实现3个简单的功能，没有优化，可以根据需求，自行添加想要实现的功能。

Book.java

package com.demo3;

public class Book {

private int id;

private String name;

private double price;

public Book(){}

public Book(int id, String name, double price) {

this.id = id;

this.name = name;

this.price = price;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

this.price = price;

}

public void showMess() {

System.out.println("Book{" +

"编号=" + getId() +

", 书名='" + getName() +

", 价格=" + getPrice() +

'}');

}

}

Tool.java

package com.demo3;

import com.sun.scenario.effect.impl.sw.sse.SSEBlend_SRC_OUTPeer;

import java.math.BigDecimal;

import java.util.Arrays;

public class Tools {

private Book[] books = new Book[20];

private int size;

public void init(){

Book book1 = new Book(1,"老人与海",29.8);

Book book2 = new Book(2,"狂人日记",36.7);

Book book3 = new Book(3,"玫瑰的葬礼",19.2);

Book book4 = new Book(4,"宇宙源头",19.2);

books[0]=book1;

books[1]=book2;

books[2]=book3;

books[3]=book4;

size=4;

}

public Book[] getBooks() {

return books;

}

public void setSize(int size) {

this.size = size;

}

/*根据编号查询图书*/

public void fingBookById(Book[] books,int id){

int i=0;http://

while(i

if(books[i].getId()== id){

System.out.println("检索信息: ");

System.out.println("-------------------Content----------------------");

books[i].showMess();

System.out.println("------------------------------------------------");

break;

}

i++;

}

if(i>=size){

System.out.println("暂无信息");

}

}

/*根据价格查找图书，返回一个新的数组*/

public Book[] findBookeByPrice(Book[] books,double price){

Book[] newBooks=new Book[books.length];

int length=0;

int i=0;

int j=0;/*注意，这里添加一个j*/

while(i

/*提高精度,这里用到了BigDecimal类*/

BigDecimal x1 = new BigDecimal(books[i].getPrice());

BigDecimal x2 = new BigDecimal(price);

if(x1.floatValue()==x2.floatValue()){

/*这里用到j，而不是下标i，如果是下标i的话，则就会出现nullpointerexception异常，因为if程序体中的 i的取值不是连续的*/

newBooks[j++]= books[i];

lSgaDJCQvength++;

}

i++;

}

/*这里用到了Array集合类中的copyRange静态方法*/

newBooks= Arrays.copyOfRange(newBooks,0,length);

return newBooks;

}

}

BookTest.java

package com.demo3;

import java.util.Scanner;

public class BookTest {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

/*创建工具类，对其进行初始化*/

Tools tool = new Tools();

tool.init();

prof: while(true) {

System.out.println("========图书检索系统=======");

System.out.println("1，【编号检索】 2，【价格检索】 3，【退出】");

System.out.print("【输入检索【类型】: ");

int num = scanner.nextInt();

while (true) {

switch (num) {

case 1:

System.out.println("进入图书【编号】检索:");

System.out.print("输入检索【编号】: ");

int checkId = scanner.nextInt();

tool.fingBookById(tool.getBooks(), checkId);break;

case 2:

System.out.println("进入图书【价格】检索");

System.out.print("输入检索【价格】：");

double price = scanner.nextDouble();

Book[] books = tool.findBookeByPrice(tool.getBooks(),price);

if(books.length>0){

System.out.println("-------------------Content----------------------");

for(Book book :books){

book.showMess();

}

System.out.println("------------------------------------------------");

};break;

case 3:

System.out.println("退出成功");

break prof;

};

break;

}

}

}

}

程序执行如下：

if(books[i].getId()== id){

System.out.println("检索信息: ");

System.out.println("-------------------Content----------------------");

books[i].showMess();

System.out.println("------------------------------------------------");

break;

}

i++;

}

if(i>=size){

System.out.println("暂无信息");

}

}

/*根据价格查找图书，返回一个新的数组*/

public Book[] findBookeByPrice(Book[] books,double price){

Book[] newBooks=new Book[books.length];

int length=0;

int i=0;

int j=0;/*注意，这里添加一个j*/

while(i

/*提高精度,这里用到了BigDecimal类*/

BigDecimal x1 = new BigDecimal(books[i].getPrice());

BigDecimal x2 = new BigDecimal(price);

if(x1.floatValue()==x2.floatValue()){

/*这里用到j，而不是下标i，如果是下标i的话，则就会出现nullpointerexception异常，因为if程序体中的 i的取值不是连续的*/

newBooks[j++]= books[i];

lSgaDJCQvength++;

}

i++;

}

/*这里用到了Array集合类中的copyRange静态方法*/

newBooks= Arrays.copyOfRange(newBooks,0,length);

return newBooks;

}

}

BookTest.java

package com.demo3;

import java.util.Scanner;

public class BookTest {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

/*创建工具类，对其进行初始化*/

Tools tool = new Tools();

tool.init();

prof: while(true) {

System.out.println("========图书检索系统=======");

System.out.println("1，【编号检索】 2，【价格检索】 3，【退出】");

System.out.print("【输入检索【类型】: ");

int num = scanner.nextInt();

while (true) {

switch (num) {

case 1:

System.out.println("进入图书【编号】检索:");

System.out.print("输入检索【编号】: ");

int checkId = scanner.nextInt();

tool.fingBookById(tool.getBooks(), checkId);break;

case 2:

System.out.println("进入图书【价格】检索");

System.out.print("输入检索【价格】：");

double price = scanner.nextDouble();

Book[] books = tool.findBookeByPrice(tool.getBooks(),price);

if(books.length>0){

System.out.println("-------------------Content----------------------");

for(Book book :books){

book.showMess();

}

System.out.println("------------------------------------------------");

};break;

case 3:

System.out.println("退出成功");

break prof;

};

break;

}

}

}

}

程序执行如下：

/*提高精度,这里用到了BigDecimal类*/

BigDecimal x1 = new BigDecimal(books[i].getPrice());

BigDecimal x2 = new BigDecimal(price);

if(x1.floatValue()==x2.floatValue()){

/*这里用到j，而不是下标i，如果是下标i的话，则就会出现nullpointerexception异常，因为if程序体中的 i的取值不是连续的*/

newBooks[j++]= books[i];

lSgaDJCQvength++;

}

i++;

}

/*这里用到了Array集合类中的copyRange静态方法*/

newBooks= Arrays.copyOfRange(newBooks,0,length);

return newBooks;

}

}

BookTest.java

package com.demo3;

import java.util.Scanner;

public class BookTest {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

/*创建工具类，对其进行初始化*/

Tools tool = new Tools();

tool.init();

prof: while(true) {

System.out.println("========图书检索系统=======");

System.out.println("1，【编号检索】 2，【价格检索】 3，【退出】");

System.out.print("【输入检索【类型】: ");

int num = scanner.nextInt();

while (true) {

switch (num) {

case 1:

System.out.println("进入图书【编号】检索:");

System.out.print("输入检索【编号】: ");

int checkId = scanner.nextInt();

tool.fingBookById(tool.getBooks(), checkId);break;

case 2:

System.out.println("进入图书【价格】检索");

System.out.print("输入检索【价格】：");

double price = scanner.nextDouble();

Book[] books = tool.findBookeByPrice(tool.getBooks(),price);

if(books.length>0){

System.out.println("-------------------Content----------------------");

for(Book book :books){

book.showMess();

}

System.out.println("------------------------------------------------");

};break;

case 3:

System.out.println("退出成功");

break prof;

};

break;

}

}

}

}

程序执行如下：

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