ATM Simulation - Implementation of a Representation for Money

/*
 * Example ATM simulation - file Money.java
 *
 * This file implements the class used to represent money,
 *
 * Copyright (c) 1997 - Russell C. Bjork
 *
 */

package atm.util;

public class Money
  {
    public Money()
      { _cents = 0;
      }
    
    public Money(int dollars)
      { _cents = 100L * dollars;
      }
    
    public Money(int dollars, long cents)
      { _cents = 100L * dollars + cents;
      }
    
    public void set(Money value)
      { _cents = value._cents;
      }
      
    static public Money add(Money first, Money second)
      { return new Money(0, first._cents + second._cents); 
      }
    
    static public Money subtract(Money minuend, Money subtrahend)
      { return new Money(0, minuend._cents - subtrahend._cents); }
    
    public Money add(Money other)
      { _cents += other._cents; 
        return this;
      }
    
    public Money subtract(Money other)
      { _cents -= other._cents; 
        return this;
      }
    
    public int dollars()
      { return (int) _cents / 100; 
      }
    
    public int cents()
      { return (int) _cents % 100;
      }
    
    public boolean equals(Money other)
      { return _cents == other._cents;
      }
    
    public boolean less(Money other)
      { return _cents < other._cents;
      }

    // Instance variable
    
    private long _cents;
  }

//