Stock.java - constructor, getters, and setters demo

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// Stock.java - A class whose objects represent stocks.
// This class demonstrates constructors, getters, setters.
// This is not a "production quality" class, which could keep
// track of the exchange, use the Internet to get the current
// price, etc.
//
// Note how getDatePurchased returns a copy of datePurchased.
// This is because (unlike Strings) Date objects are mutable.
// If you return a reference to the date, it might get changed!
// This technique is called "making defensive copies".  You don't
// need to use it with immutable objects or primitives.
//
// Written 10/2008 by Wayne Pollock, Tampa Florida USA

import java.util.Date;

class Stock
{
   private final String symbol;
   private final String name;
   private final Date datePurchased;
   private final float initialPrice;  // price per share

   private float currentPrice;
   private Date priceDate;  // date when price last changed
   private String broker;  // Stock broker

   public Stock ( String symbol, String name, float price )
   {
      this.symbol = symbol;
      this.name = name;
      this.datePurchased = new Date();
      if ( price <= 0 )
         throw new IllegalArgumentException( "bad price" );
      this.initialPrice = price;
      this.priceDate = datePurchased;
   }

   public String getSymbol () { return symbol; }
   public String getName () { return name; }
   public Date getDatePurchased () { return (Date) datePurchased.clone(); }
   public float getInitialPrice () { return initialPrice; }
   public float getCurrentPrice () { return currentPrice; }
   public String getBroker () { return broker; }

   public void setCurrentPrice ( float newPrice )
   {
      if ( newPrice <= 0 )
         throw new IllegalArgumentException( "bad price" );
      currentPrice = newPrice;
      priceDate = new Date();
   }

   public void setBroker ( String broker )
   {
      this.broker = broker;
   }
}