creat a text file with name .nanorc
and add following lines in it
include "/usr/share/nano/java.nanorc"
include "/usr/share/nano/c.nanorc"
copy the java.nanorc & c.nanorc files using following commands
cp /usr/share/nano/java.nanorc .
cp /usr/share/nano/c.nanorc .
place both files in your home directory