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    <p>I'm guessing your new <code>NumberAxis</code> instances aren't being used by the plot; it may be easier to use the existing ones from the factory.</p> <p><img src="https://i.stack.imgur.com/W0UFV.png" alt="enter image description here"></p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.util.*; import javax.swing.AbstractAction; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import org.jfree.chart.*; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.axis.NumberTickUnit; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.XYItemRenderer; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; /** * @see http://stackoverflow.com/questions/7231824 * @see http://stackoverflow.com/questions/7205742 * @see http://stackoverflow.com/questions/7208657 * @see http://stackoverflow.com/questions/7071057 */ public class ScatterAdd extends JFrame { private static final int N = 8; private static final String title = "Scatter Add Demo"; private static final Random rand = new Random(); private XYSeries added = new XYSeries("Added"); public ScatterAdd(String s) { super(s); final ChartPanel chartPanel = createDemoPanel(); this.add(chartPanel, BorderLayout.CENTER); JPanel control = new JPanel(); control.add(new JButton(new AbstractAction("Add") { @Override public void actionPerformed(ActionEvent e) { for (int i = 0; i &lt; N; i++) { added.add(rand.nextDouble(), rand.nextDouble()); } } })); this.add(control, BorderLayout.SOUTH); } private ChartPanel createDemoPanel() { JFreeChart jfreechart = ChartFactory.createScatterPlot( title, "X", "Y", createSampleData(), PlotOrientation.VERTICAL, true, true, false); XYPlot xyPlot = (XYPlot) jfreechart.getPlot(); xyPlot.setDomainCrosshairVisible(true); xyPlot.setRangeCrosshairVisible(true); XYItemRenderer renderer = xyPlot.getRenderer(); renderer.setSeriesPaint(0, Color.blue); NumberAxis domain = (NumberAxis) xyPlot.getDomainAxis(); domain.setRange(0.00, 1.00); domain.setTickUnit(new NumberTickUnit(0.1)); domain.setVerticalTickLabels(true); NumberAxis range = (NumberAxis) xyPlot.getRangeAxis(); range.setRange(0.0, 1.0); range.setTickUnit(new NumberTickUnit(0.1)); return new ChartPanel(jfreechart); } private XYDataset createSampleData() { XYSeriesCollection xySeriesCollection = new XYSeriesCollection(); XYSeries series = new XYSeries("Random"); for (int i = 0; i &lt; N * N; i++) { double x = rand.nextDouble(); double y = rand.nextDouble(); series.add(x, y); } xySeriesCollection.addSeries(series); xySeriesCollection.addSeries(added); return xySeriesCollection; } public static void main(String args[]) { EventQueue.invokeLater(new Runnable() { @Override public void run() { ScatterAdd demo = new ScatterAdd(title); demo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); demo.pack(); demo.setLocationRelativeTo(null); demo.setVisible(true); } }); } } </code></pre>
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    1. COThanks Trashgod...for ur example
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    2. COYou're welcome; you might also examine [`JFreeChart.createScatterPlot()`](http://www.jfree.org/jfreechart/api/javadoc/src-html/org/jfree/chart/ChartFactory.html#line.1464) itself.
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    3. COhow can i change the size of blue markers? I would like to make blue markers bigger but keep the size of red ones unchanged
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