public class Euler23 {

    public static void main(String[] args) {
        Abundant tester = new Abundant(28123);



        tester.notAbundantSummableFiller();
        tester.abundantNumberChecker();
        //  tester.abundantNumberPrinter();


        tester.abundantSummableCalculator();


        System.out.println("total: " + tester.notAbundantSummableSum());
    }

}


import java.util.ArrayList;

public class Abundant {

    private ArrayList<Integer> abundantNumbers;
    private ArrayList<Integer> notAbundantSummable;
    private int originalSize;

    public Abundant(int n) {
        this.abundantNumbers = new ArrayList();
        this.notAbundantSummable = new ArrayList();
        this.originalSize = n;
    }

    public void notAbundantSummableFiller() {
        for (int i = 1; i <= this.originalSize; i++) {
            this.notAbundantSummable.add(i);
        }
    }

    public boolean isAbundantNumber(int n) {
        if (this.sumOfDivisors(n) > n) {
            return true;
        }
        return false;
    }

    public void abundantNumberChecker() {
        for (int i = 1; i <= this.notAbundantSummable.size(); i++) {
            if (this.isAbundantNumber(i)) {
                this.abundantNumbers.add(i);
            }
        }
    }

    public void abundantSummableCalculator() {
        int i = 0;

        while (this.abundantNumbers.get(i) <= this.originalSize / 2) {

            for (int j = i; this.abundantNumbers.get(j) + this.abundantNumbers.get(i) <= (this.originalSize); j++) {
                /*System.out.println("i: " + i + "; j: " + j);
                System.out.println("number to subtract: " + Integer.valueOf(this.abundantNumbers.get(i))
                        + " " + Integer.valueOf(this.abundantNumbers.get(j)) + " " + this.);*/
                this.notAbundantSummable.remove(Integer.valueOf(this.abundantNumbers.get(i) + this.abundantNumbers.get(j)));
                //System.out.println("removed: " + (this.abundantNumbers.get(i) + this.abundantNumbers.get(j)));
            }
            i++;
        }
    }

    public int notAbundantSummableSum() {
        int sum = 0;
        //System.out.println("this: " + this.notAbundantSummable + " that: " + this.numberToSubtract);
        for(int x: this.notAbundantSummable){
            sum = sum + x;
        }
        return sum;
    }

    public void abundantNumberPrinter() {
        for (int x : this.abundantNumbers) {
            System.out.println(x);
        }
    }

    public int sumOfDivisors(int n) {
        int sum = 0;

        if (n % 2 == 0) {
            for (int i = 2; i <= Math.sqrt(n); i++) {
                if (n % i == 0) {
                    if (i == Math.sqrt(n)) {
                        sum = sum + n / i;
                    }
                    else {
                        sum = sum + n / i + i;
                    }
                }
            }
        }
        else {
            for (int i = 3; i <= Math.sqrt(n); i = i + 2) {
                if (n % i == 0) {
                    if (i == Math.sqrt(n)) {
                        sum = sum + n / i;
                    }
                    else {
                        sum = sum + n / i + i;
                    }
                }
            }
        }
        return sum + 1;
    }

}