("Java_home" sets the installation path of the jdk, such as "e: java jdk1.5", hereinafter referred to as "% java_home%". "Path", set the path of each program in the jdk, "% java_home% bin;% java_home% jre bin;" "Classpath", set the path of each java class, ".;% java_home% lib;% java_home% lib tools. jar". The preceding "." is indispensable. It represents the working way that everyone builds for their own java classes. The other is the standard class library way that comes with jdk
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