I want to have x and y on same scale in my program,I found the resource from http://www.xspace.org/Other/index.html#JFreeChart . But when I use the codes from http://www.xspace.org/Other/JFreeChart-XSpace.zip, the exception is catched like this:
testFourDataSetsSingleGraph(org.jfree.chart.plot.JFreeChartTester)java.lang.NoSuchMethodError: org.jfree.chart.plot.XYPlot.useEqualAxes(V)Z
at org.jfree.chart.plot.JFreeChartTester.testFourDataSetsSingleGraph(JFreeChartTester.java:106)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at org.jfree.chart.plot.JFreeChartTester.main(JFreeChartTester.java:29)
Why can't be found the useEqualAxes(V) method ? I'm a newbie,Thanks for your help!