In the Unix environment, use a java program file to read a csv file(comma-separated values file). For example: food.csv its content is

Hamburger,Jenny,$5

Apple,Lucy,$1.5

Pizza,Lily,$8

Now I have finished a simple Java file to read this CSV and changes it into this: (rotate the last field to the first)

$5,Hamburger,Jenny

$1.5,Apple,Lucy

$8,Pizza,Lily

The question is to use this program without changing codes and without other Unix commands to create the output like this:

Jenny,$5,Hamburger

Lucy,$1.5,Apple

Lily,$8,Pizza

How do I do? I could not use any Unix command. I am a rookie, this question made me mad..