14-06-2015 Java_Home and Path

JAVA_HOME和Path

JAVA_HOME

and

JRE_HOME

are
not used by Java itself. Some third-party programs (for example Apache Tomcat) expect one of these environment variables to be set to the installation directory of the

JDK

or

JRE

.
If you are not using software that requires them, you do not need to set

JAVA_HOME

and

JRE_HOME

.

PATH

is
an environment variable used by the operating system (Windows, Mac OS X, Linux) where it will look for native executable programs to run. You should add the

bin

subdirectory
of your

JDK

installation
directory to the

PATH

,
so that you can use the

javac

and

java

commands
and other

JDK

tools
in a command prompt window.