import java.io.*; public class StockFile extends StockInfo { static final int ITEM_NAME_BYTES = 25; static final int QUANTITY_BYTES = 4; static final int DEPARTMENT_BYTES = 25; static final int RECORD_BYTES = ITEM_NAME_BYTES + QUANTITY_BYTES + DEPARTMENT_BYTES; public void StockFile(String itemName, int quantity, String Department) throws IOException { super(); setItemName(FixLength(getItemName(), ITEM_NAME_BYTES)); } public StockFile(String itemName, int quantity, String department) { super(itemName, quantity, ...