This tutorial shows how to list all system properties in one shot and execute
external programs through java. We can use Runtime to execute any windows
or Linux binary file. If your executable is in system PATH you can directly
specify the executable name otherwise you need to specify the executable with
full path. Still in doubt check the PATH environment variable. As notepad.exe
is available in folder C:\WINDOWS\system32 which is already appended to system PATH
we don't need to specify the full path.