BookList类用来存Book类，查找书

[java]代码库

import java.util.*; 
public class Main{
	
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		BookList bl = new BookList();
		int n = s.nextInt();
		for (int i=0; i<n;i++) {
			bl.addBook(new Book(s.next(),s.nextInt(),s.next(),s.nextInt()));
		}
		bl.searchBook(new Book(s.next(),0,s.next(),s.nextInt()));
	}
}

class Book{
	String name;
	int price;
	String author;
	int number;
	public Book(String na, String au, int num) {
		name = na;
		author = au;
		number = num;
	}
	public Book(String na, int p, String au, int num) {
		name = na;
		price = p;
		author = au;
		number = num;
	}
	public String getName() {
		return name;
	}
	public String getAuthor() {
		return author;
	}
	public int getNumber() {
		return number;
	}
}

class BookList{
	List<Book> L = new LinkedList<Book>();
	public void addBook(Book b) {
		L.add(b);
	}
	public void searchBook(Book b) {
		int i, flag = 0;
		for(i = 0; i < L.size(); i++) {
			if(L.get(i).getName().equals(b.getName()) && L.get(i).getAuthor().equals(b.getAuthor()) && L.get(i).getNumber()==b.getNumber()) {
				flag = 1;
				System.out.println("found: " +i);
			}
		}
		if(flag == 0) 
			System.out.println("not found");
	}
}