Practice using anonymous inner classes

Knowledge is power: If you use Comparator.comparing() you just need getters in the Stock class for name and date and a method that calcs the profit (if key 'change' is in the map -> change, else 'last' - 'open' ... thanks Dan). then you just chain together the Comparators and you're done (use method references as parameter for the comparing(), then comparing methods like Stock::getName, that way you save a lot of anonymous class overhead) the chain then looks smth like that: Comparator.comparing(... the method ref ...).thenComparing(...).... Don't forget to reverse the last property. For that there is a overloaded thenComparing method that takes a second argument (keyExtractor and keyComparator -> the keyExtractor is the above mentioned method reference for the keyComparator you can use one of Comparators static methods: reverseOrder()). The result then looks stunningly simple.

The final challenge was incredibly difficult for me. Without spoiling anything, here's my advice. Once you've created your comparator and fixed the exception issue: 1: Make sure the the stocks sort alphabetically 2: Make all stock names the same, and ensure that the list populates first with the newest stock Date (Jan 2 2032 should appear before Jan 1 2032) 3: Make all stock names AND dates the same, and ensure that the list populates with the highest profit per day (Change 0.06 is bigger than open 1.00, last 1.05) Info on calculating profits: Stocks with change -- They give you the end of day totals, and they tell you whether it was a positive or negative change Stocks with open and last -- You have to do the legwork here to figure out if the stock went up or down. If it opens at 2 dollars and ends at 1.99, that means the profit is -0.01 Good Luck!

Bro... Knowledge is power... bro.. no, bro.. just no... that's another programming language...wth...

These tasks make no sense to me... and harly help in understanding anonymous classes...