// A Coin class to be used for 
// obtaining head or tail.

public class Coin
{
    private boolean headsUp;

    public Coin( )
    {
        flip( );
    }

    public Coin(boolean headShowing)
    {
        headsUp = headShowing;
    }

    public boolean isHeadsUp( )
    {
        return headsUp;
    }

    public void setHeadsUp(boolean headShowing)
    {
        headsUp = headShowing;
    }

    public void flip( )
    {
        if (Math.random( ) >= 0.5)
            headsUp = true;
        else
            headsUp = false;
    }

    public String toString( )
    {
        return headsUp ? "head" : "tail";
    }
}