java如何实现图书检索系统

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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;    }        public void fingBookById(Book[] books,int id){        int i=0;        while(i<size){            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");        }    }        public Book[] findBookeByPrice(Book[] books,double price){        Book[]  newBooks=new Book[books.length];        int length=0;        int i=0;        int j=0;        while(i<size){                        BigDecimal x1 = new BigDecimal(books[i].getPrice());            BigDecimal x2 = new BigDecimal(price);            if(x1.floatValue()==x2.floatValue()){                                newBooks[j++]= books[i];                length++;            }            i++;        }                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);                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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