Here's some system specs they are running your code in:
~~~~~~~
Executing Build Command: javac /root/HelloWorld.java
Executing Run Command: java -classpath /root HelloWorld
Cores: 4
CPU Arch: amd64
Total Mem (Bytes JVM sees): 236257280
Max Mem (Bytes JVM sees): 3506438144
Free Mem (Bytes JVM sees): 235023784
Root Dirs: /
Get OS (direct output): Linux
Get OS (sanitized output): Unix/Linux
OS Arch: 64
Process exited successfully
~~~~~~~~
http://runnable.com/U4zos2qEWoJSgH4Z/sys-info-example-for-ja...