I am majoring in computer science and want to know how do I dedicate 3 hours a day learning how to code Java.

• adventofcode

  718 65 9.0 Scala

  Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 in Scala (by sim642)

As for programming exercises outside of that, I can definitely recommend Advent of Code, which is held every year on december 1-25 (thus advent) and gives you two programming exercises each day that become progressively harder. The exercises of years 2015-2021 are readily available for you. Some of these might be challenging for you as a freshman though, since they tend to use highly theoretical concepts you may only learn about in a later semester. Nonetheless try them, and if you're stuck you can always ask for help over at /r/adventofcode or simply look for solutions on github or in the subreddit.

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