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Showing content from https://github.com/dave-burke/advent-of-code-java-starter below:

dave-burke/advent-of-code-java-starter: A project to get you started solving Advent of Code puzzles in Java

A project to get you started solving Advent of Code challenge in Java.

The Main method in App will execute the code for a given day based on input in src/main/resources/day[number].txt

The given Day class will process the input and return a result, which App will print to stdout.

1. Each day's puzzle will have an input consisting of one or more lines of plain text.
2. Each day's puzzle will have two "parts" requiring separate implementations, but using the same input.
3. Puzzle solutions will be a single line of text.
4. Each puzzle description will provide at least one example input/output.

The shell for day 1 is already there. These are the steps to add day 2, etc. For day 1 you can start by writing the test cases once the puzzle posts.

1. Create src/main/java/aoc/day02/Day02.java and make sure it implements Day
2. Create src/main/test/aoc/day02/Day02Test.java and use the sample input/output from adventofcode.com to write tests (they will initially fail). Use Day01Test.java as an example.
3. Implement Day02.part1() until the tests pass (Test Driven Development!). You can run ./gradlew --continuous check to have the tests run every time you save your code.
4. When the example input passes, get your input from adventofcode.com and save it as src/main/resources/day02.txt
5. Run ./gradlew run --args="2" to get your output.
   • Notice the day number ("2") is passed as an argument.
   • If you are working on the puzzle for today (e.g. it is December 3rd and you are working on Day03), then you can just run ./gradlew run.
6. Check your solution on adventofcode.com!

1. Add new tests for part 2 to Day02Test.java using the sample input/output from adventofcode.com
2. Implement Day02.part2() until the tests pass.
3. When the example input passes, run ./gradlew run --args="2 2" to get your output.
   • Notice the second argument to the script is the part number. It defaults to 1, so now you have to pass it as 2.
4. Check your solution on adventofcode.com!

If you are using VSCode, this project comes with a launch template that will prompt you for arguments. Enter just the day (to run part 1) or the day and part to run part 2.

• If you want to run Day 3 part 1, just type 3
• If you want to run Day 4 part 2, type 4 2

If you want to run a day directly (e.g. run Day01.java) you can just add a main method to your Day01 class:

public static void main(String[] args) {
    App.runPart1ForDay(1);
}

Call runPart1ForDay for part 2. Make sure you specify the correct day number (1 in the example above)!

The App calls defaultYear() which defaults to the current year during December, and the previous year otherwise. If you want to use this starter to work on another year, just hard code the value of year in App.main to return the year you want.

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