Hey, I need some help with Java Programming.

My homework is to write a program that provides conversions for weights of an object on earth, mars, and the moon.

Here is the detailed description of the task: Your program should contain four methods that perform the conversionstwo methods will be given an objects weight on earth and convert it to equivalent weights on mars and the moon, and two methods will be given an objects weight on mars and on the moon and convert it to equivalent weight on earth. The program must prompt the user for the input values.

Not looking for a solution, I'm just not sure where to start.

Thanks in Advance!