public class Coda
{
    private Comparable[] array;
    private int front;
    private int back;
    public Coda()
    {
        array = new Comparable[10];
        makeEmpty();
    }
    public void makeEmpty()
    {
        front = 0;
        back = 0;
    }
    public boolean isEmpty()
    {
        return (front == back);
    }
    protected static int increment (int index)
    {
        return (index+1)%array.length;
    }
    private static Comparable[] resize(Comparable[] a, int newdim)
    {
        Comparable[] n = new Comparable[newdim];
        System.arraycopy(a,0,n,0,a.length);
        return n;
    }