public int findmybook(String findID) throws ClassNotFoundException{

		try{
			int findnum =0;
			@SuppressWarnings("resource")
			ObjectInputStream osb = new ObjectInputStream(new FileInputStream("bookcollection.txt"));///óϾ , Ͼ׳ϴ° ҽ߰
			this.setBookCount(osb.readInt());
			collectionb.clear();
			System.out.println(""+'\t'+ ""+ '\t'+"ǻ"+'\t'+"ISBN"+'\t'+"⿩"+'\t'+"뿩");	
			System.out.println("*******************************************************************");
			for( int i= 0; i< this.getBookCount();i++){
				Book ms = (Book)osb.readObject();
				collectionb.add(i,ms);
				if((ms.borrower).equals(findID)){
					System.out.println(ms.toString());
					findnum++;
				}
			}
			if(findnum > 0){
				return 1;
			}else
				return -1;
		}catch(IOException e){
		}
		return -1;
	}