JDK版本错误：java.lang.UnsupportedClassVersionError: Bad version number in .class file。
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用二进制编辑工具（例如EmEditor）打开类文件，有以下的显示：
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CA FE BA BE 00 00 00 32.....
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而上面的32是编译这个类的JDK版本，32表示是50，是JDK1.6；31表示49，是JDK1.5；30表示48，是JDK1.4......依次类推。
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