ATM Simulation Implementation - the Cash Dispenser

/*
 * Example ATM simulation - file CashDispenser.java
 *
 * This file implements the class that manages the ATM's cash dispenser
 *
 * Copyright (c) 1997 - Russell C. Bjork
 *
 */

package atm.atmparts;
import java.awt.*;
import atm.util.Money;

//

Class CashDispenser

public class CashDispenser extends Panel
  {     

    //

    public CashDispenser()
      { setLayout(new GridLayout(1,1));
        _label = new Label("$XXX", Label.CENTER);
        _label.setFont(new Font("Helvetica", Font.PLAIN, 24));
        _label.setForeground(new Color(0, 64, 0));
        add(_label);
        _label.hide();
        _currentCash = new Money(0);
      }

    //

    public void setCash(Money initialCash)
      { _currentCash = initialCash; 
      }

    //

    public void dispenseCash(Money amount)
      { _label.setText("$" + amount.dollars());
        for (int size = 3; size <= 24; size += 1)
          { _label.setFont(new Font("Helvetica", Font.PLAIN, size));
            _label.show();
            try
              { Thread.sleep(250); }
            catch (InterruptedException e)
              { }
            _label.hide();
          }
        _currentCash.subtract(amount);
      }
    
    //

    public Money currentCash()
      { return _currentCash;
      }
      
    //

    // Instance variable
    
    private Money _currentCash;

    //

    // This field is needed for the GUI
    
    private Label _label;    
  }

//