reader.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.reader;
import chapter7.book.system.SysUser;
import chapter7.book.bookmanage.Book;
import chapter7.book.booklend.LendRecord;
public class Reader extends SysUser
{
	LibraryCard card;
	
	public void createCard()
	{
		LibraryCard card = null;
		//此处，省略相关借书证办理相关代码
		this.card = card;
	}
	
	public void delCard()
	{
	    //此处，省略相关借书证注销相关代码		
	}
	
	public boolean subscribe(int bookID)
	{   
		Book book = new Book(bookID);
		if(book == null)
		{
			System.out.println("图书不存在，无法订阅");
			return false;
		}
		LendRecord record = new LendRecord(book,this.card);
		if(!record.checkSubscribe())
		{
			System.out.println("按规定不可订阅该书");
			return false;
		}
		return record.subscribe();
	}
	
	public boolean continueLend(int bookID)
	{
		Book book = new Book(bookID);
		if(book == null)
		{
			System.out.println("图书不存在，无法续借");
			return false;
		}
		LendRecord record = new LendRecord(book,this.card);
		//作继续登记工作
		return record.continueLend();	
	}
}