public String toString() {
		//Get borrower's fully information as the format required.
		String result;
		result = "name                " + this.name
				+ System.getProperty("line.separator");
		result += "birthday            " + this.getBirthday()
				+ System.getProperty("line.separator");
		if (this.phone != 0) {
			result += "phone               " + this.phone
					+ System.getProperty("line.separator");
		}
		if (this.email != null) {
			result += "email               " + this.email
					+ System.getProperty("line.separator");
		}
		if (this.address != null) {
			result += "address             " + this.address
					+ System.getProperty("line.separator");
		}
		if (this.booklist.size() != 0) {
			result += "booklist            " + this.getBook();
		}
		return result;
	}