Java Environment Setup

• download jdk
• install jdk
• configuration environment

configuration

1. set JAVA_HOME
   JAVA_HOME=D:/java/jdk/

2. set JRE_HOME(optional)
   JRE_HOME=D:/java/jdk/jre/

3. set Path
   Path=%JAVA_HOME%/bin/;%JRE_HOME%/bin/;

4. set CLASSPATH
   CLASSPATH=.;%JAVA_HOME%/lib/dt.jar;%JAVA_HOME%/lib/tools.jar;

   tools.jar is used to compile the system when a class is used when using javac

   dt.jar on the operating environment of the library, mainly swing package when you need to swing with the best.