How to answer this?

Question

Can i ask how to code this question using selection? (Java:BlueJ)

Question:
A program requires a user to enter two non-negative integer values. If any of the values entered is negative, the message "Number must be non-negative" is displayed and the algorithm terminates. Otherwise, it displays the sum of the values if the first values is less than the second value. Or else, the product of the two values is displayed.

Answer 1

Declare first variable.
Declare second variable.
Input to first variable.
Input to second variable.

If first variable or second variable is negative
Print "Number must be non-negative"
Else if first variable smaller than second variable
Print first variable + second variable
Else
Print first variable * second variable

Just convert the above to Java, and show your attempts if you have any issues.

Answer 2

how to terminate the program when its negative? thx for your feeback btw :)