//RealTimeChart .java 
import org.jfree.chart.ChartFactory; 
import org.jfree.chart.ChartPanel; 
import org.jfree.chart.JFreeChart; 
import org.jfree.chart.axis.ValueAxis; 
import org.jfree.chart.plot.XYPlot; 
import org.jfree.data.time.Millisecond; 
import org.jfree.data.time.TimeSeries; 
import org.jfree.data.time.TimeSeriesCollection; 
 
public class RealTimeChart extends ChartPanel implements Runnable 
{ 
 private static TimeSeries timeSeries; 
 private long value=0; 
  
 public RealTimeChart(String chartContent,String title,String yaxisName) 
 { 
  super(createChart(chartContent,title,yaxisName)); 
 } 
  
 private static JFreeChart createChart(String chartContent,String title,String yaxisName){ 
  //創建時序圖對象 
  timeSeries = new TimeSeries(chartContent,Millisecond.class); 
  TimeSeriesCollection timeseriescollection = new TimeSeriesCollection(timeSeries); 
  JFreeChart jfreechart = ChartFactory.createTimeSeriesChart(title,"時間(秒)",yaxisName,timeseriescollection,true,true,false); 
  XYPlot xyplot = jfreechart.getXYPlot(); 
  //縱坐標設定 
  ValueAxis valueaxis = xyplot.getDomainAxis(); 
  //自動設置數據軸數據范圍 
  valueaxis.setAutoRange(true); 
  //數據軸固定數據范圍 30s 
  valueaxis.setFixedAutoRange(30000D); 
 
  valueaxis = xyplot.getRangeAxis(); 
  //valueaxis.setRange(0.0D,200D); 
 
  return jfreechart; 
  } 
 
 public void run() 
 { 
  while(true) 
  { 
  try 
  { 
   timeSeries.add(new Millisecond(), randomNum()); 
   Thread.sleep(300); 
  } 
  catch (InterruptedException e) { } 
  }   
 } 
  
 private long randomNum() 
 {  
  System.out.println((Math.random()*20+80));  
  return (long)(Math.random()*20+80); 
 } 
} 
 
//Test.java 
import java.awt.BorderLayout; 
import java.awt.event.WindowAdapter; 
import java.awt.event.WindowEvent; 
import javax.swing.JFrame; 
 
public class Test 
{ 
 
 /** 
  * @param args 
  */ 
 public static void main(String[] args) 
 { 
 JFrame frame=new JFrame("Test Chart"); 
 RealTimeChart rtcp=new RealTimeChart("Random Data","隨機數","數值"); 
 frame.getContentPane().add(rtcp,new BorderLayout().CENTER); 
 frame.pack(); 
 frame.setVisible(true); 
 (new Thread(rtcp)).start(); 
 frame.addWindowListener(new WindowAdapter() 
 { 
  public void windowClosing(WindowEvent windowevent) 
  { 
   System.exit(0); 
  } 
 
 }); 
 } 
}