bookmanageimpl.java

在达内培训

package biz;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import entity.Book;

public class BookManageImpl implements BookManage {
	/*
	 * 涔﹀簱
	 */
	private Set<Book> books = new HashSet<Book>();

	@Override
	public boolean addBook(Book book) {
		if(books.contains(book)){
			return false;
		}
		books.add(book);
		return true;
	}

	@Override
	public boolean back(int bookId) {
		Iterator<Book> it = books.iterator();
		while(it.hasNext()){
			Book b = it.next();
			if(b.getBookId() == bookId){
				b.setBorrowed(false);
				return true;
			}
		}
		return false;
	}

	@Override
	public boolean borrowBook(int bookId) {
		Iterator<Book> it = books.iterator();
		while(it.hasNext()){
			Book b = it.next();
			if(b.getBookId() == bookId){
				b.setBorrowed(true);
				return true;
			}
		}
		return false;
	}

	@Override
	public boolean delBookById(int bookId) {
		Iterator<Book> it = books.iterator();
		while(it.hasNext()){
			Book b = it.next();
			if(b.getBookId() == bookId){
				//鏍规嵁id鍒犻櫎涔︾洰
				//鍦ㄨ凯浠ｅ櫒涓