There are two ways that come to mind.

One is to put the numbers in an array then call
Arrays.sort on this array. The element at offset 0
(the first elemnt in the array will be the smallest.

The other is to loop through all the numbers holding
the current smallest number in a temporary variable.
If the current number is smaller than the temporary
assign its valule to the temporary variable.

The code for both are quite simple  so I will not post
it here but asy so if you need it and I'm sure
somebody on this list(including myself) can give you
the code.