MOOC.FI Java Programming 1 and Java Programming 2 is a good course to learn Java because it has practice assignments that you turn in for a grade that will be auto graded-> https://java-programming.mooc.fi/part-1 You can find a project/or exercise to code You can get a book such as "Starting out with Programming logic & Design" that has programming exercises in them More on reddit.com

I can assure you that the length of the solution and the algorithms used make it seem more complicated than it really is... When you boil it down, you’re basically just getting two binary numbers from the user, adding them together (one bit at a time until you’ve added everything), and then printing the result. My suggestion would be to start by practicing binary addition on paper. I find it significantly easier than trying to “calculate it” in a program, mostly because the + operator doesn’t work with binary the same way it works with decimals. Once you feel like you can easily add binary numbers on paper, take a look at the code inside of that “while” loop again. Make sure you understand what the modulo (%) operator is doing, and why we need a remainder... The (binary % 10) section divides the number by 10 and gives you the remainder... All this is doing is getting the FIRST digit in the number. Think about it: 10101 divided by 10 gives you a remainder of 1, right? So what you’re really doing is just adding the first digits of the two binary numbers together, saving the result as the first digit of your “sum”, checking if there was a remainder, and (if there was) carrying it over to the next digit... Think of it like adding 19 and 17: When you add the first two digits (9 and 7) you get 16, so you put 6 as the first digit of your sum and carry the 10 over to the next position. Anyway, I might not be an expert, but I really do suggest mastering binary addition on paper and then making a program that solves it essentially the same way you do it on paper. Good luck! More on reddit.com

If you want some more challanges ike that, I suggest you check out HackerRank where they have a lot of coding challanges you can complete in any language you want. More on reddit.com

Take a look at the MOOC Java Programming as it is a textual course with plenty graded practical exercises.

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