lendlist.java

使用swing做的熟悉控件使用的DEMO

package book;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Collection;
import java.util.ArrayList;
import userexception.*;


/**
* class LendList
*/
public class LendList {
	private static LendList instance;
	private ArrayList books;
	
	//constructor
	private LendList() {
		books = new ArrayList();
	}

	//static method to get the instance
	public synchronized static LendList getInstance() {
		if(instance == null) instance = new LendList();
		return instance;
	}

	//add a book to the lendlist
	public void addBook(Book bk) {
		books.add(bk);
	}

	//remove a book from the lendlist
	public void removeBook(Book bk) throws BookNotFoundException {
		int idx = books.indexOf(bk);
		if(idx != -1) {
			books.remove(books.indexOf(bk));
		}else {
			throw new BookNotFoundException();
		}
	}
}