import java.io.*;

public class SGH

{

public static void writeToFile(Book b[],int n)throws Exception{

FileOutputStream fout=new FileOutputStream("book.dat");

ObjectOutputStream oout=new ObjectOutputStream(fout);

for(int i=0;i

oout.writeObject(b[i]);

}

oout.close();

}

public static Book[]readFromFile(int n)throws Exception{

Book Book1[]=new Book[n];

FileInputStream fin=new FileInputStream("book.dat");

ObjectInputStream oin=new ObjectInputStream(fin);

for(int i=0;i

Book1[i]=(Book)oin.readObject();

}

oin.close();

return Book1;

}

public static void main(String args[])throws Exception

{

Book Book1[]=new Book[3];

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

Book1[i]=new Book((3+i),("书"+(i)));

}

Book Book2[];

writeToFile(Book1,3);

Book2=readFromFile(3);

}

}

class Book implements Serializable

{

public float price;

public String bookName;

public Book(float p,String b)

{

this.price=p;

this.bookName=b;