/** Abstract base class for drawing simple shapes on the screen using keyboard characters. */public abstract class ShapeBase implements ShapeInterface{    private int offset;         public ShapeBase( )    {        offset = 0;    }    public ShapeBase(int theOffset)    {        offset = theOffset;    }    /**     Draws the shape at the current line.    */    public abstract void drawHere( );                  /**     Draws the shape at lineNumber lines down     from the current line.    */    public void drawAt(int lineNumber)    {        for (int count = 0; count < lineNumber; count++)            System.out.println( );         drawHere( );    }         public void setOffset(int newOffset)    {        offset = newOffset;    }    public int getOffset( )    {        return offset;    }}