gorauskas / Euler.Java

Solutions to project euler problems written in Java 11

Euler

Solutions to the Project Euler problems written in Java 11.

Clone this repo and then run the following from the command line:

mvn clean package
java -jar target/euler.jar -p <problem number>

Usage

Project Euler problems & solutions written in Java 11

 java -jar euler.jar [-v|-V|-?] -p <number>

 -V               : Displays the version information and exits. (default: false)
 -h (--help, -?)  : Displays this help message and exits. (default: true)
 -p (--problem) N : Specify the problem/solution number you want to run.
                    (default: 0)
 -v               : Verbose outputs the problem statement and the solution.
                    (default: false)

 Example:
  java -jar euler.jar -v -p 1

Tests

Alternatively, there is a full set of unit tests written with jUnit that can be run by invoking maven at the root of the project, like so:

mvn clean test

How it works...

The main program in the App class will try to import one of the solution classes from com.gorauskas.euler.solutions based on the problem number passed in via the command line. From that package, it will load a class called Euler# where # is for the problem number. If the user requests verbose output, the program calls the getProblem method of the loaded Euler# class and then calls the getAnswer method.

All Euler# classes are implemented using the Euler common interface for all classes. This is the key construct that allows classes to be loaded and executed dynamically.