Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2014, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. * Other names may be trademarks of their respective owners.] * * ---------------- * XYZDataItem.java * ---------------- * (C) Copyright 2014, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited). * Contributor(s): -; * * Changes * ------- * 25-Apr-2014 : Version 1, copied from the Orson Charts project * (http://www.object-refinery.com/orsoncharts) (DG); * */ package org.jfree.data.xyz; import java.io.Serializable; /** * Represents a single <code>(x, y, z)</code> data item, which can be added to * a {@link XYZSeries}. Instances of this class are immutable. * <br><br> * NOTE: This class is serializable, but the serialization format is subject * to change in future releases and should not be relied upon for persisting * instances of this class. */ @SuppressWarnings("serial") public class XYZDataItem implements Serializable { /** The x-value. */ private final double x; /** The y-value. */ private final double y; /** The z-value. */ private final double z; /** * Creates a new (immutable) instance. * * @param x the x-value. * @param y the y-value. * @param z the z-value. */ public XYZDataItem(double x, double y, double z) { this.x = x; this.y = y; this.z = z; } /** * Returns the x-value. * * @return The x-value. */ public double getX() { return x; } /** * Returns the y-value. * * @return The y-value. */ public double getY() { return y; } /** * Returns the z-value. * * @return The z-value. */ public double getZ() { return z; } /** * Tests this instance for equality with an arbitrary object. * * @param obj the object (<code>null</code> permitted). * * @return A boolean. */ @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof XYZDataItem)) { return false; } XYZDataItem that = (XYZDataItem) obj; if (this.x != that.x) { return false; } if (this.y != that.y) { return false; } if (this.z != that.z) { return false; } return true; } @Override public int hashCode() { int hash = 5; hash = 79 * hash + (int) (Double.doubleToLongBits(this.x) ^ (Double.doubleToLongBits(this.x) >>> 32)); hash = 79 * hash + (int) (Double.doubleToLongBits(this.y) ^ (Double.doubleToLongBits(this.y) >>> 32)); hash = 79 * hash + (int) (Double.doubleToLongBits(this.z) ^ (Double.doubleToLongBits(this.z) >>> 32)); return hash; } }