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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.
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/* ===========================================================
 * 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.]
 *
 * ------------------------------------
 * BoxAndWhiskerToolTipGenerator.java
 * ------------------------------------
 * (C) Copyright 2004-2014, by David Browning and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 02-Jun-2004 : Version 1 (DG);
 * 23-Mar-2005 : Implemented PublicCloneable (DG);
 *
 */

package org.jfree.chart.labels;

import java.io.Serializable;
import java.text.MessageFormat;
import java.text.NumberFormat;

import org.jfree.data.category.CategoryDataset;
import org.jfree.data.statistics.BoxAndWhiskerCategoryDataset;
import org.jfree.util.PublicCloneable;

/**
 * An item label generator for plots that use data from a
 * {@link BoxAndWhiskerCategoryDataset}.
 * 
 * The tooltip text and item label text are composed using a
 * {@link java.text.MessageFormat} object, that can aggregate some or all of
 * the following string values into a message.
 * 

 * 0 : Series Name
 * 1 : X (value or date)
 * 2 : Mean
 * 3 : Median
 * 4 : Minimum
 * 5 : Maximum
 * 6 : Quartile 1
 * 7 : Quartile 3
 * 
 */
public class BoxAndWhiskerToolTipGenerator
        extends StandardCategoryToolTipGenerator
        implements CategoryToolTipGenerator, Cloneable, PublicCloneable,
                   Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -6076837753823076334L;

    /** The default tooltip format string. */
    public static final String DEFAULT_TOOL_TIP_FORMAT
            = "X: {1} Mean: {2} Median: {3} Min: {4} Max: {5} Q1: {6} Q3: {7} ";

    /**
     * Creates a default tool tip generator.
     */
    public BoxAndWhiskerToolTipGenerator() {
        super(DEFAULT_TOOL_TIP_FORMAT, NumberFormat.getInstance());
    }

    /**
     * Creates a tool tip formatter.
     *
     * @param format  the tool tip format string.
     * @param formatter  the formatter.
     */
    public BoxAndWhiskerToolTipGenerator(String format,
                                         NumberFormat formatter) {
        super(format, formatter);
    }

    /**
     * Creates the array of items that can be passed to the
     * {@link MessageFormat} class for creating labels.
     *
     * @param dataset  the dataset (null not permitted).
     * @param series  the series (zero-based index).
     * @param item  the item (zero-based index).
     *
     * @return The items (never null).
     */
    @Override
    protected Object[] createItemArray(CategoryDataset dataset, int series,
                                       int item) {
        Object[] result = new Object[8];
        result[0] = dataset.getRowKey(series);
        Number y = dataset.getValue(series, item);
        NumberFormat formatter = getNumberFormat();
        result[1] = formatter.format(y);
        if (dataset instanceof BoxAndWhiskerCategoryDataset) {
            BoxAndWhiskerCategoryDataset d
                = (BoxAndWhiskerCategoryDataset) dataset;
            result[2] = formatter.format(d.getMeanValue(series, item));
            result[3] = formatter.format(d.getMedianValue(series, item));
            result[4] = formatter.format(d.getMinRegularValue(series, item));
            result[5] = formatter.format(d.getMaxRegularValue(series, item));
            result[6] = formatter.format(d.getQ1Value(series, item));
            result[7] = formatter.format(d.getQ3Value(series, item));
        }
        return result;
    }

    /**
     * Tests if this object is equal to another.
     *
     * @param obj  the other object.
     *
     * @return A boolean.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof BoxAndWhiskerToolTipGenerator) {
            return super.equals(obj);
        }
        return false;
    }

}