CSCI 146: Lab 2 Materials

The main goal of Lab 2 is for the students to complete a simple class, called Currency.

• How to write, save, compile, build, and execute the Currency program in Java.
• How to write documentation using Javadoc.

  Here is the Currency program in Java:
  

  
  //Add javadoc with your name as author.  The actual author is S. Sahni.
  public class Currency
  {
     // class constants
     public static final boolean PLUS = true;
     public static final boolean MINUS = false;
  
     // instance data members
     private boolean sign;
     private long dollars;
     private byte cents;
  
     // constructors
     public Currency(boolean theSign, long theDollars, byte theCents)
     {
   ...
   ...
     }
  
     public Currency()
        {...}
  
     public Currency(double theValue)
        {...}
  
     // accessor methods
     public boolean getSign()
        {...}
  
     public long getDollars()
        {...}
  
     public byte getCents()
        {...}
  
     // mutator methods
     public void setSign(boolean theSign)
        {...}
   
     public void setDollars(long theDollars)
     {
   ...
   ...
     }
  
     public void setCents(byte theCents)
     {
   ...
   ...
     }
  
     public void setValue(double theValue)
     {
        if (theValue < 0)
        {
       ...
       ...
        }
        else
           sign = PLUS;
  
        ... // extract integral part
  
        // get two decimal digits
        ...
     }
    public void setValue(Currency x)
     {
        sign = x.sign;
        dollars = x.dollars;
        cents = x.cents;
     }
     
     public String toString()
     {
        if (sign == PLUS)
           {return "$" + dollars + "." + cents;}
        else
           {return "-$" + dollars + "." + cents;}
     }
  
     
     public static void main(String [] args)
     {
        // test constructors
        Currency g = new Currency(),
                 h = new Currency(PLUS, 3L, (byte) 50),
                 i = new Currency(-2.50),
                 j = new Currency();
  
       // test toString
        System.out.println("The initial values are " + g +
                           " " + h + " " + i + " " + j);
        System.out.println();
  
        // test mutators
        // first make g nonzero
        g.setDollars(2);
        g.setSign(MINUS);
        g.setCents((byte) 25);
        i.setValue(-6.45);
        System.out.println("New values are " + g + " " + i);
        System.out.println();
  
   
     }
  }