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用java写的helloword，已设置过环境变量，但还是打不开程序。为啥阿？? 400 报错双击程序，命令提示符一闪就关了。啥都还没看清，就没了。。系统是win8 jdk1.7 环境变量：CLASSPATH D:\java\jdk1.7.0_17\jre\lib JAVA_HOME...

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