Example: Stacked Bar Chart

import com.imsl.chart.*;
import com.imsl.stat.Random;
import java.awt.Color;

public class BarEx1 extends javax.swing.JApplet {

    private JPanelChart panel;

    public void init() {
        Chart chart = new Chart(this);
        panel = new JPanelChart(chart);
        getContentPane().add(panel, java.awt.BorderLayout.CENTER);
        setup(chart);
    }

    static private void setup(Chart chart) {
        AxisXY axis = new AxisXY(chart);

        int nStacks = 2;
        int nGroups = 3;
        int nItems = 6;

        //	Generate some random data
        Random r = new Random(123457);
        double y[][][] = new double[nStacks][nGroups][nItems];

        for (int istack = 0; istack < y.length; istack++) {
            for (int jgroup = 0; jgroup < y[istack].length; jgroup++) {
                for (int kitem = 0; kitem < y[istack][jgroup].length;
                        kitem++) {
                    y[istack][jgroup][kitem] = r.nextDouble();
                }
            }
        }

        //	Create an instance of a Bar Chart
        Bar bar = new Bar(axis, y);

        //	Set the Bar Chart Title
        chart.getChartTitle().setTitle("Sales by Region");

        //	Set the fill outline type;
        bar.setFillOutlineType(Bar.FILL_TYPE_SOLID);

        //	Set the Bar Item fill colors
        bar.getBarSet(0, 0).setFillColor(Color.red);
        bar.getBarSet(0, 1).setFillColor(Color.yellow);
        bar.getBarSet(0, 2).setFillColor(Color.green);
        bar.getBarSet(1, 0).setFillColor(Color.blue);
        bar.getBarSet(1, 1).setFillColor(Color.cyan);
        bar.getBarSet(1, 2).setFillColor(Color.magenta);

        chart.getLegend().setPaint(true);
        bar.getBarSet(0, 0).setTitle("Red");
        bar.getBarSet(0, 1).setTitle("Yellow");
        bar.getBarSet(0, 2).setTitle("Green");
        bar.getBarSet(1, 0).setTitle("Blue");
        bar.getBarSet(1, 1).setTitle("Cyan");
        bar.getBarSet(1, 2).setTitle("Magenta");

        // Setup the vertical axis for a labeled bar chart.
        String labels[] = {
            "New York",
            "Texas",
            "Northern\nCalifornia",
            "Southern\nCalifornia",
            "Colorado",
            "New Jersey"
        };
        bar.setLabels(labels, bar.BAR_TYPE_VERTICAL);

        //	Set the text angle
        axis.getAxisX().getAxisLabel().setTextAngle(270);

        //	Set the Y axis title
        axis.getAxisY().getAxisTitle().setTitle("Sales ($million)\nby "
                + "widget color");
    }

    public static void main(String argv[]) {
        JFrameChart frame = new JFrameChart();
        BarEx1.setup(frame.getChart());
        frame.setVisible(true);
    }
}

Output

Link to Java source.