用java编写一个程序 急求

import java.util.Scanner;
public class BookTest {
/**
* @param args
*/
public static void main(String[] args) {
Book data_structure = new Book("9787900643223","数据结构",46d,256);
Scanner scan = new Scanner(System.in);
System.out.println("请输入图书编号：");
String bookno = scan.next();
if (data_structure.getBookno().equals(bookno)) {
System.out.println("查找到的图书：" + data_structure);
}
else {
System.out.println("未找到图书！");
}
}

}
class Book {
private String bookno;
private String bookname;
private Double bookprice;
private Integer bookamount;

public Book(String bookno, String bookname, Double bookprice,
Integer bookamount) {
super();
this.bookno = bookno;
this.bookname = bookname;
this.bookprice = bookprice;
this.bookamount = bookamount;
}
public Book() {
super();
// TODO Auto-generated constructor stub
}
public String getBookno() {
return bookno;
}
public void setBookno(String bookno) {
this.bookno = bookno;
}
public String getBookname() {
return bookname;
}
public void setBookname(String bookname) {
this.bookname = bookname;
}
public Double getBookprice() {
return bookprice;
}
public void setBookprice(Double bookprice) {
this.bookprice = bookprice;
}
public Integer getBookamount() {
return bookamount;
}
public void setBookamount(Integer bookamount) {
this.bookamount = bookamount;
}
@Override
public String toString() {
return "Book [bookno=" + bookno + ", bookname=" + bookname
+ ", bookprice=" + bookprice + ", bookamount=" + bookamount
+ "]";
}

}

望采纳！

package test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import com.ObjectFileConvert;
/**
* @author wxiangd
*
*/
public class Book implements Serializable {
private String no;
private String name;
private double price;
private int amount;
public Book() {
}

public Book(String no, String name, double price, int amount) {
this.no = no;
this.name = name;
this.price = price;
this.amount = amount;
}

public String getNo() {
return no;
}
public void setNo(String no) {
this.no = no;
}
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 int getAmount() {
return amount;
}
public void setAmount(int amount) {
this.amount = amount;
}
/**
* 文件转化为Object
* @param fileName
* @return byte[]
*/
public static Object file2Object(String fileName) {

FileInputStream fis = null;
ObjectInputStream ois = null;
try {
fis = new FileInputStream(fileName);
ois = new ObjectInputStream(fis);
Object object = ois.readObject();
return object;
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
if (ois != null) {
try {
ois.close();
} catch (IOException e2) {
e2.printStackTrace();
}
}
}
return null;
}

/**
* 把Object输出到文件
* @param obj
* @param outputFile
*/
public static void object2File(Object obj, String outputFile) {
ObjectOutputStream oos = null;
FileOutputStream fos = null;
try {
fos = new FileOutputStream(new File(outputFile));
oos = new ObjectOutputStream(fos);
oos.writeObject(obj);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (oos != null) {
try {
oos.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e2) {
e2.printStackTrace();
}
}
}
}

public static void main(String[] args) {

String fileName = "d:/test/object.obj";
List<Book> list = new ArrayList<Book>();
Book data_structure = new Book("9787900643223", "数据结构", 46, 256);
Book yellow = new Book("9787900643224", "金瓶梅", 180, 1);
list.add(data_structure);
list.add(yellow);

object2File(list, fileName);
System.out.println("success write List<String> to file.");

List<Book> tmpList = (List<Book>)file2Object(fileName);
for (Book tmp : tmpList) {
if(tmp.no.equals("9787900643223")){
System.out.println("no: "+tmp.no);
System.out.println("name: "+tmp.name);
System.out.println("price"+tmp.price);
System.out.println("amount: "+tmp.amount);
}
}
}
}
//混蛋，不是应该这样做的么

明显JAVA基础作业= =追问

那你帮忙编一下啊

追答

自己写 这个是你的作业又不是别人的 编程工具里点几下敲几十个字符就完事
哪怕你用记事本 所有步骤书上都有写 你为什么就不尝试自己写出来呢

追问

我们刚刚开课几节 怎么会啊 况且这个书上又没有 不然都自己写了

追答

怎么会没有 书又不会直接给你答案让你抄
你看看书上写没写 类 私有属性 方法
肯定有换个名字 功能一模一样的玩意= =

不要怪就开几节课 这些玩意再慢第三节课也涉及了
想抄就直接说= =
import java.util.Scanner;
public class Book
{
Book(String bookname,String bookno,int bookprice,int bookamount){
this.bookname=bookname;
this.bookno=bookno;
this.bookprice=bookprice;
this.bookamount=bookamount;
}
private String bookname;
private String bookno;
private int bookprice;
private int bookamount;
public String getBookname() {
return bookname;
}
public void setBookname(String bookname) {
this.bookname = bookname;
}
public String getBookno() {
return bookno;
}
public void setBookno(String bookno) {
this.bookno = bookno;
}
public int getBookprice() {
return bookprice;
}
public void setBookprice(int bookprice) {
this.bookprice = bookprice;
}
public int getBookamount() {
return bookamount;
}
public void setBookamount(int bookamount) {
this.bookamount = bookamount;
}
@Override
public String toString() {
return "Book [图书库存量为：" + bookamount + "本, 图书名称为：" + bookname
+ ", 该书的图书编号为：" + bookno + ", 图书单价为：" + bookprice + "]";
}
public static void main(String[] data)
{
Book data_structure=new Book("数据结构","9787900643223",46,256);
System.out.println("请输入编号");
Scanner a=new Scanner(System.in);
String st=a.nextLine();
System.out.println(data_structure.getBookno());
if(st.equals(data_structure.getBookno()))System.out.println(data_structure.toString());
else System.out.println("无信息");
}
}

懒得写，分太少追问

多少分你才写啊 不要说100我没有

public class Book {
private String bookname;// 图书名称
private String bookno;// 图书编号
private double bookprice;// 图书单价
private int bookamount;// 图书库存量

public String getBookname() {
return bookname;
}

public void setBookname(String bookname) {
this.bookname = bookname;
}

public String getBookno() {
return bookno;
}

public void setBookno(String bookno) {
this.bookno = bookno;
}

public double getBookprice() {
return bookprice;
}

public void setBookprice(double bookprice) {
this.bookprice = bookprice;
}

public int getBookamount() {
return bookamount;
}

public void setBookamount(int bookamount) {
this.bookamount = bookamount;
}

public static void main(String[] args) {
//第一本书对象
Book data_structure=new Book();
data_structure.setBookno("9787900643223");
data_structure.setBookname("数据结构");
data_structure.setBookprice(46);
data_structure.setBookamount(256);
//第一本书对象
Book data_struct=new Book();
data_struct.setBookno("9787900643200");
data_struct.setBookname("软件工程");
data_struct.setBookprice(55);
data_struct.setBookamount(203);
Scanner scanner=new Scanner(System.in);
String dataNo;
while (true) {
System.out.println("请输入图书编号:0为退出循环");
dataNo=scanner.next();
if (dataNo.equals("9787900643223")) {
System.out.println("图书信息如下:");
System.out.println("图书编号: "+data_structure.getBookno());
System.out.println("图书名称: "+data_structure.getBookname());
System.out.println("图书价格: "+data_structure.getBookprice());
System.out.println("图书存储量: "+data_structure.getBookamount());
}else if(dataNo.equals("9787900643200")){
System.out.println("图书编号: "+data_struct.getBookno());
System.out.println("图书名称: "+data_struct.getBookname());
System.out.println("图书价格: "+data_struct.getBookprice());
System.out.println("图书存储量: "+data_struct.getBookamount());
}
}
}
}
这里我创建两本书对象，望采纳。。