Bonus task | Lesson 12 | Level 5

The IDE can trip you up in the last exercise because the imports are hidden by default when you first open it up. One of those imports is very important and it's easy to (wrongly) assume that the test cases will be low enough to not require it. It's not an issue in the browser because obviously the imports are not automatically hidden there, and just knowing that the important one is there is the difference between solving the exercise in one go and getting a slight headache.

I have no clue why we need the modifier "volatile" in private static volatile Moon instance; I also don't understand the use of "synchronized" in the method. Not a good surprise. public static Moon getInstance() { if (instance == null) { synchronized (Moon.class) { if (instance == null) { instance = new Moon(); } } } return instance; }

task1521 (Different methods for different types) caveat: this one really takes the biscuit... Ignore anything that the task descriptions says about what the new info functions should/might print. The output must be *exactly* like that of the existing info function - down to the erroneous blank before the comma - except for the substitution indicated by the formal requirements (i.e. the bulleted list items).

YEAH!!!! Solved "Different methods for different types" in just 3 hours and just in 9 tries! I consider myself one of the smartest people on the universe!!! P.S. I love this feeling of solving a complex task and all the excitement after that! Please, do excuse me for being so ... ah, you know what I mean, I'm just too happy! :D

I have now officially calculated 150 factorial. Thanks BigInteger. You make life swell.

for me the factorial was brutal as it started spewing out negative numbers...but lots of fun and lots of learning, awesome.

Oh man, I spent about 3 days (4 h / day) on "Different methods for different types" and "Request Parser" .... man.. I'm telling you, these must have been the most brutal problems for me.. I just couldn't wrap my head around them, around CodeGym's requirements. If it wouldn't have been for long conversation with Nouser and Misiu in the help section for each problem I don't know if I would have been able to solve them so quickly. But the most important thing, I DID NOT GIVE UP. I just kept on trying, day after day, even if at one point I just dreaded trying to start and solve the problems. So, I believe you can do it, you just gotta keep pushin at it, keep trying. Best of luck and NEVER give up!

learned a lot from these courses. just a thought -- sometimes if you have the urge to peek over other's solved answers to validate if you are going the right direction with your own code then I think probably you must not do that unless you are really stuck(check multiple answers in this case). Just do the way you are doing without looking until you reach the edge and ofcourse google search is very useful. Guilty is charged -- I was the victim of the above in 2 of the tasks above, just to find out that i was going the right way, i would have felt much better if i had solved those two without wandering around. Enjoyed it a lot!! :)

Apart frm me , who else also copied and paste some of the answers? let me know whether to stop learning at this point

Had a lot of fun with Request parser task. It is quite convenient to store parameters as key-value pairs. But if you do it the same way, make sure to use LinkenHashMap, because order matters in this task.