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Java执行main方法,异常为:could not find the main class.program will exit

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could not find the main class.program will exit!



原因和解决办法如下:
出现这个错误是由于你的jdk版本与eclipse高版本配置造成的.
因为我们使用高版本的JDK编译的Java class文件试图在较低版本的JVM上运行,所报的错误。   因为,高版本的JDK生成的class文件使用的格式,可能与低版本的JDK的.class文件格式不同。这样,低版本的JVM无法解释执行这个.class文件,会抛出Could not find the main class.program will exit不支持的Class版本错误。


解决方法:
1. 弄清楚该程序是在哪个JDK版本下开发的
2. 在myEclipse 菜单->Windows->Proferences->java-> Installs  Jres重新设置JDK路径,改为开发程序时的JDK版本(我做到这一步就可以了!我的eclipse是7.0,jdk是6u13的。)
3. Windows->Proferences->java->Compiler,将compiler compliance level设置为与上面相同的JDK
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