import java.util.Vector;                 // Java container class
import java.util.Date;                   // auto generate a date, convert to String
public class Transaction {
  public int TRANS_NO;                   // primary key
  public String DATE;                    // date as a String
  public Account account;                // reference to parent
  public Stock stock;                    // reference to parent
  public String TYPE;                    // public visibility: same as record struct
  public double PRICE;
  public int QTY;
  public static int base_trans = 1000;   // static var to auto generate tranaction numbers

  public Transaction(Account account, Stock stock, String TYPE, double PRICE, int QTY) {
    this.account = account; this.stock = stock; this.TYPE = TYPE; this.PRICE = PRICE; 
    this.QTY = QTY;
    TRANS_NO = base_trans++;               // auto generate
    Date date = new Date();                // get date/time right now
    DATE = date.toString();                // store as a String
    account.transactions.addElement(this); // add itself to it's parent's list of children
  }
  public String toString() {
    return (TRANS_NO + " " + DATE + " " + account.ACCOUNT_NO + " " + stock.SYM + " " + TYPE + 
            " " + PRICE + " " + QTY);
  }
}