Java

I wanted to write a representative version of Euler1 in Java, a pure Object-Oriented language developed in 1995 by Sun, but I failed. It turns out that this is a stupid idea - OOP is just overkill for what is essentially a simple function. There is no benefit to construing a simple function in terms of classes. This is the problem with languages like Java and Haskell that rigidly enforce purity – there will always be edge cases that require you to subvert the paradigm.

Anyway, here is my attempt – a class with members, a constructor, and a method. Obviously overkill, but it is cleanly defined. Java is my bread and butter language, so it took me only a minute to write the following:

// Euler1 in Java

class Euler1 {
    private int size;
    private int result;

    public Euler1(int size) {
        this.size = size;
    }

    public void solve() {
        result = 0;
        for (int i=0; i<size; i++) {
            if (i%3==0 || i%5==0) {
                result += i;
            }
        }
    }

    public int getResult() {
        return result;
    }

    public static void main(String[] args) {
        Euler1 euler1 = new Euler1(1000);

        euler1.solve();

        System.out.println(euler1.getResult());
    }
}

To run this, compile to bytecode using the java compiler, then execute the resultant class file:

$ javac Euler1.java
$ java Euler1
233168