librarian.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter7.book.librarian;
import chapter7.book.reader.LibraryCard;
import chapter7.book.system.SysUser;
import chapter7.book.bookmanage.Book;
import chapter7.book.booklend.LendRecord;
public class Librarian extends SysUser
{
	// 借书操作
	public boolean lendBook(int bookID ,String cardNo)
	{
		//图书查询,获取图书信息
		Book book = new Book(bookID);//根据bookID创建Book对象
		if(book ==null)
		{
			System.out.println("图书不存在，无法借书");
			return false;
		}
		//获取借书证信息
		LibraryCard card = new LibraryCard(cardNo);
		//借书证自检,以判定该借书证可否借书
		if(!card.checkSelf())
		{
			System.out.println("借书证不存在或借书数量超过最大数，无法借书");
			return false;
		}
		//图书借阅记录查询，检查是否可以借书
		LendRecord record = new LendRecord(book,card);
		if(!record.checkLend())
		{
			System.out.println("书已被预订或出借");
			return false;
		}
		//借书登记
		return record.lend();
	}
	//还书操作
	public boolean returnBook(int bookID)
	{
		LendRecord record = new LendRecord(bookID);
		record.returnBook();
		return true;
	}
	public void buyBook()
	{
		//此处省略图书采购具体实现 
	}
}