Replicate these values on your AWS console:

You will get this screen.

At that screen, go to the "code" section and upload your java code with the lambda:

Something like this:

Next, configure the runtime settings:

Finally, to test your Hello World lambda function, go to the "test" tab and click on Test button, you will get something like this:

Next time you run the same lambda, you will realize the values have changed because, second time AWS only had to run, instead of configure all as the first time it did it.