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上传时间: 2014-03-16
详细说明： 1. I'm getting classpath errors (NoClassDefFoundException etc.), can you help me? The usual causes of classpath problems are (in order of frequency): New users that don't really understand what the classpath is about, and how it works. If this is you, find a good introductory book on Java and read up about the classpath until you understand it. You won't get anywhere with Java until you understand how Java finds and loads classes. You have more than one copy of the JFreeChart and/or JCommon jar files on the current classpath. Yo u have an out-of-date version of JCommon (this is not really a classpath issue, but users often report it as such). Very occasionally, a jar file can be corrupted for whatever reason. If nothing else works for you, try downloading a fresh copy of the required jar file(s) (this goes for any jar file, not just the JFreeChart/JCommon jar files). 2. I can't find the source code for classes in the org.jfree.ui package (for example, org.jfree.ui.RefineryUtilities). Where are they? The org.jfree.ui package is part of the JCommon class library. The runtime jar file is included in the JFreeChart distribution, source code and documentation is available separately from: http://www.jfree.org/jcommon/index.html Like JFreeChart, JCommon is also licensed under the terms of the GNU Lesser General Public Licence. 3. Can I use JFreeChart in an applet? Yes, there is a demo at http://www.object-refinery.com/jfreechart/applet.html. There are some provisos though: you need a web browser that supports Java 2 (JDK 1.3.1 or higher). To find out what version your browser supports, try the following web page: http://javatester.org/version.html Virtually all browsers support Java 2 EXCEPT for Microsoft Internet Explorer (MSIE). You can install Sun's Java Plugin to get MSIE to work properly or, better still, download and install FireFox. JFreeChart doesn't incorporate any special applet features. For example, you can't pass data to the chart applet via HTML as you can in some charting packages. we haven't made any special effort to minimise the size of the JFreeChart jar files. It is something that could be done, but really the demand for it is low, so it hasn't been done yet. 4. Can I use JFreeChart in a commercial (closed source) application? Do I need to pay a fee? Yes, the licence (GNU LGPL) allows this. There is no licence fee to pay, but you must adhere to the terms of the licence. There is more information contained at the end of the jfreechart-version-install.pdf document. 5. Does JFreeChart support real-time charting? Not really. JFreeChart includes an event-notification mechanism that ensures that charts are updated whenever the dataset is updated. However, the chart is completely repainted for each update, which limits the "frames per second" rate that you can achieve with JFreeChart. Typically, updating once per second is fine, but updating multiple times per second results in high CPU load. If you want to pursue this, do some performance testing with your specific configuration and use cases. 6. I want to set my own colors for each series in my chart. How do I do that? You can use the setSeriesPaint() method in the renderer. For example, the following code could be used for a bar chart: ...展开收缩
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