public Book print(int ISBN) {
		try{

			@SuppressWarnings("resource")
			ObjectInputStream osi = new ObjectInputStream(new FileInputStream("bookcollection.txt"));///óϾ , Ͼ׳ϴ° ҽ߰
			this.setBookCount(osi.readInt());
			collectionb.clear();
			for( int i= 0; i< this.getBookCount();i++){
				Book ms = (Book)osi.readObject();
				collectionb.add(i,ms);
			}		
			System.out.println(""+'\t'+ ""+ '\t'+"ǻ"+'\t'+"ISBN"+'\t'+"⿩"+'\t'+"뿩");	
			System.out.println("*******************************************************************");
			for(i = 0; i<this.getBookCount() ; i++){
				if((collectionb.elementAt(i).ISBN)==ISBN)
				{	
					System.out.println(collectionb.elementAt(i).toString());
					return collectionb.elementAt(i);
				}
			}
		}catch(Exception e){

		}
		return null;
	}