Java tutorial
/* * =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors. * Project Info: http://www.jfree.org/jfreechart/index.html * This library is free software; you can redistribute it and/or modify it under the terms * of the GNU Lesser General Public License as published by the Free Software Foundation; * either version 2.1 of the License, or (at your option) any later version. * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Lesser General Public License for more details. * You should have received a copy of the GNU Lesser General Public License along with this * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * -------------- * XYDataset.java * -------------- * (C) Copyright 2000-2004, by Object Refinery Limited. * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * $Id: XYDataset.java,v 1.1 2011-01-31 09:02:18 klukas Exp $ * Changes (from 18-Sep-2001) * -------------------------- * 18-Sep-2001 : Added standard header and fixed DOS encoding problem (DG); * 15-Oct-2001 : Moved to a new package (com.jrefinery.data.*) (DG); * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG); * 17-Nov-2001 : Now extends SeriesDataset (DG); */ package org.jfree.data; /** * An interface through which data in the form of (x, y) items can be accessed. */ public interface XYDataset extends SeriesDataset { /** * Returns the number of items in a series. * * @param series * the series (zero-based index). * @return The item count. */ public int getItemCount(int series); /** * Returns the x-value for an item within a series. The x-values may or may not be returned * in ascending order, that is up to the class implementing the interface. * * @param series * the series (zero-based index). * @param item * the item (zero-based index). * @return The x-value (possibly <code>null</code>). */ public Number getXValue(int series, int item); /** * Returns the x-value (as a double primitive) for an item within a series. * * @param series * the series (zero-based index). * @param item * the item (zero-based index). * @return The x-value. */ public double getX(int series, int item); /** * Returns the y-value for an item within a series. * * @param series * the series (zero-based index). * @param item * the item (zero-based index). * @return the y-value (possibly <code>null</code>). */ public Number getYValue(int series, int item); /** * Returns the y-value (as a double primitive) for an item within a series. * * @param series * the series (zero-based index). * @param item * the item (zero-based index). * @return The y-value. */ public double getY(int series, int item); }