/**
 * FractionArrayTest class
 * 
 * @author Erica Eddy
 * @version December 2010
 * 
 * This class demonstrates how allocating and using
 * an array of objects differs from that of allocating
 * and using an array of primitives.
 */
public class FractionArrayTest
{
    // instance variables
    private int [] num;         // an array of integers (primitives)
    private Fraction [] frac;   // an array of objects (Fractions)
    private int numberOfFracs;  // keeps track of number of positions filled
    
    // Constructor
    // declares both arrays
    // needs to initialize the number of elements in the object array
    public FractionArrayTest()  {
        num = new int[5];
        frac = new Fraction[5];
        numberOfFracs = 0;
    }
    
    // fill array
    // Each object must be instantiated in order to fill the object array
    public void fillArray() {
        num[0] = 5;
        num[1] = 2;
        num[2] = 4;
        num[3] = 6;
        num[4] = 1;
        Fraction temp = new Fraction(5,75);
        frac[0] = temp;
        frac[1] = new Fraction(1,1);
        numberOfFracs = 2;
    }
    
    // print array contents
    // the loop to print the object array must depend on the number of
    // array slots filled, not the object array length
    public void printArray()    {
        for (int i = 0; i < num.length; i++)
            System.out.println("num[" + i + "] = " + num[i]);
            
        for (int k = 0; k < numberOfFracs; k++)
            System.out.println("frac[" + k + "] = " + frac[k].toString());
    }
}