Como Subtrair Números com a JGA

import net.sf.jga.fn.algorithm.Accumulate;
import net.sf.jga.fn.arithmetic.Minus;

import java.util.ArrayList;
import java.util.List;

import static java.lang.System.out;

public final class JgaSample {

  public static void main(final String[] args) {
    final List<Integer> list = new ArrayList<Integer>();

    list.add(1);

    list.add(2);

    final Accumulate<Integer> functor = new Accumulate<Integer>(new Minus<Integer>(Integer.class));

    out.println(functor.fn(list.iterator()));
  }

}
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