Moving help please

private boolean pressingLeft = false;
private boolean pressingRight = false;

public void act()
{
    if (Greenfoot.isKeyDown("left"))
    {
        if (!pressingLeft)
        {
            pressingLeft = true;
            setRotation(getRotation() - 90);
        }
    }
    else
        pressingLeft = false;

    if (Greenfoot.isKeyDown("right"))
    {
        if (!pressingRight)
        {
            pressingRight = true;
            setRotation(getRotation() + 90);
        }
    }
    else
        pressingRight = false;
}