e087. setting the value of a system property from the command line.txt

这里面包含了一百多个JAVA源文件

A system property can be set or overridden by specifying the -D option to the java command when running your program. 
    java -Dmy.prop="my value" MyApp


    // Get the value of the system property
    String prop = System.getProperty("my.prop");
    // my value

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