JFreeChart学习（三）——动态打印java内存使用情况

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JFreeChart动态打印java内存使用情况
import java.awt.BasicStroke;                                                                      import java.awt.BorderLayout;                                                                     import java.awt.Color;                                                                            import java.awt.Font;                                                                             import java.awt.event.ActionEvent;                                                                import java.awt.event.ActionListener;                                                             import java.awt.event.WindowAdapter;                                                              import java.awt.event.WindowEvent;                                                                                                                                                                  import javax.swing.BorderFactory;                                                                 import javax.swing.JFrame;                                                                        import javax.swing.JPanel;                                                                        import javax.swing.Timer;                                                                                                                                                                           import org.jfree.chart.ChartPanel;                                                                import org.jfree.chart.JFreeChart;                                                                import org.jfree.chart.axis.DateAxis;                                                             import org.jfree.chart.axis.NumberAxis;                                                           import org.jfree.chart.plot.XYPlot;                                                               import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;                                        import org.jfree.data.time.Millisecond;                                                           import org.jfree.data.time.TimeSeries;                                                            import org.jfree.data.time.TimeSeriesCollection;                                                  import org.jfree.ui.RectangleInsets;                                                                                                                                                                public class MemoryUsage extends JPanel {                                                                                                                                                               class DataGenerator extends Timer implements ActionListener {                                                                                                                                           /*                                                                                                 * Invoked when an action occurs.                                                                  *                                                                                                 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)                  */                                                                                               public void actionPerformed(ActionEvent actionevent) {                                                long free = Runtime.getRuntime().freeMemory();                                                    long total = Runtime.getRuntime().totalMemory();                                                  addTotalObservation(total);                                                                       addFreeObservation(free);                                                                     }                                                                                                                                                                                                   DataGenerator(int i) {                                                                                super(i, null);                                                                                   addActionListener(this);                                                                      }                                                                                             }                                                                                                                                                                                                   public MemoryUsage(int maxItemAge) {                                                                  super(new BorderLayout());                                                                        total = new TimeSeries("Total Memory",                                                                    org.jfree.data.time.Millisecond.class);                                                   total.setMaximumItemAge(maxItemAge);                                                      //        free = new TimeSeries("Free Memory",                                                      //                org.jfree.data.time.Millisecond.class);          free = new TimeSeries("Free Memory");                        free.setMaximumItemAge(maxItemAge);                                                                                                                                                                 TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();                           timeseriescollection.addSeries(total);                                                            timeseriescollection.addSeries(free);                                                                                                                                                               DateAxis dateaxis = new DateAxis("Time");                                                         NumberAxis numberaxis = new NumberAxis("Memory");                                                 dateaxis.setTickLabelFont(new Font("SansSerif", 0, 12));                                          numberaxis.setTickLabelFont(new Font("SansSerif", 0, 12));                                        dateaxis.setLabelFont(new Font("SansSerif", 0, 14));                                              numberaxis.setLabelFont(new Font("SansSerif", 0, 14));                                            dateaxis.setAutoRange(true);                                                                      dateaxis.setLowerMargin(0.0D);                                                                    dateaxis.setUpperMargin(0.0D);                                                                    dateaxis.setTickLabelsVisible(true);                                                              numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());                                                                                                                               XYLineAndShapeRenderer xylineandshaperenderer = new XYLineAndShapeRenderer(                               true, false);                                                                             xylineandshaperenderer.setSeriesPaint(0, Color.RED); // 改变第一个Series的颜色                    xylineandshaperenderer.setSeriesPaint(1, Color.YELLOW);// 改变第二个Series的颜色                  xylineandshaperenderer.setSeriesStroke(0, new BasicStroke(1F, 0, 2));                             xylineandshaperenderer.setSeriesStroke(1, new BasicStroke(1F, 0, 2));                                                                                                                               XYPlot xyplot = new XYPlot(timeseriescollection, dateaxis, numberaxis,                                    xylineandshaperenderer);                                                                  xyplot.setBackgroundPaint(Color.BLACK); // 改变背景颜色                                           xyplot.setDomainGridlinePaint(Color.white);                                                       xyplot.setRangeGridlinePaint(Color.white);                                                        xyplot.setAxisOffset(new RectangleInsets(1D, 1D, 1D, 1D));                                                                                                                                          JFreeChart jfreechart = new JFreeChart("JVM Memory Usage", new Font(                                      "SansSerif", 1, 24), xyplot, true);                                                       jfreechart.setBackgroundPaint(Color.white);                                                                                                                                                         ChartPanel chartpanel = new ChartPanel(jfreechart, true);                                         chartpanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory                                     .createEmptyBorder(10, 10, 10, 10), BorderFactory                                                 .createLineBorder(Color.black)));                                                                                                                                                           add(chartpanel);                                                                              }                                                                                                                                                                                                   private void addTotalObservation(double d) {                                                          total.add(new Millisecond(), d);                                                              }                                                                                                                                                                                                   private void addFreeObservation(double d) {                                                           free.add(new Millisecond(), d);                                                               }                                                                                                                                                                                                   /**                                                                                                * @param args                                                                                     */                                                                                               public static void main(String[] args) {                                                              JFrame jframe = new JFrame("JVM Memory Usage");                                                   MemoryUsage memoryusagedemo = new MemoryUsage(10000);                                             jframe.getContentPane().add(memoryusagedemo, "Center");                                           jframe.setBounds(200, 120, 1000, 500);                                                            jframe.setVisible(true);                                                                          (memoryusagedemo.new DataGenerator(1000)).start();                                                jframe.addWindowListener(new WindowAdapter() {                                                        public void windowClosing(WindowEvent windowevent) {                                                  System.exit(0);                                                                               }                                                                                             });                                                                                           }                                                                                                                                                                                                   private TimeSeries total;                                                                         private TimeSeries free;                                                                      }
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