给定一个double数组和一个值，求出数组中某几个数的和等于给定的值

给定一个double数组和一个值，求出数组中某几个数的和等于给定的值java

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;


public class Test {

    public static void main(String[] args) {

        // 测试
        double[] doubles = {1.11, 2.22, 3.33, 4.44, 5.55, 6.66, 7.77, 8.88, 9.99};
        List<List<Double>> lists = calculate(doubles, 9.99);
        for (List<Double> list : lists) {
            for (Double aDouble : list) {
                System.out.print(aDouble + " ");
            }
            System.out.println();
        }

    }

    /*** * 给定一个double数组和一个值，求出数组中某几个数的和等于给定的值。 * @param doubles 给定的数组 * @param dn 给定的值 * @return 计算的结果 */
    public static List<List<Double>> calculate(double[] doubles, Double dn) {
        List<Double> list = new ArrayList<>(doubles.length);
        for (double aDouble : doubles) {
            list.add(aDouble);
        }
        List<List<Double>> ret = new ArrayList<>();
        int a = 1, c = 1;
        List<Double> d;
        for (int i = 0; i < list.size(); i++) {
            double s = list.get(i);
            //StringBuffer str = new StringBuffer(list.get(i) + "+");
            boolean bb = true;
            while (bb) {
                if (bb = false) {
                    break;
                }
                if (list.size() == a) {
                    break;
                }
                while (true) {
                    if (list.size() == c) {
                        a++;
                        c = a;
                        break;
                    }
                    d = new ArrayList<>();
                    d.add(list.get(i));
                    for (int j = c; j < list.size(); j++) {
                        s = add(s, list.get(j));
                        d.add(list.get(j));
                        //str.append(list.get(j) + "+");
                        //System.out.println(str.substring(0, str.length() - 1));
                        String d1 = Double.toString(s);
                        String d2 = Double.toString(dn);
                        if (d2.equals(d1)) {
                            ret.add(d);
                            break;
                        }
                        if (list.size() - j == 1) {
                            s = list.get(i);
                            //str = new StringBuffer(list.get(i) + "+");
                            c++;
                            break;
                        }
                    }
                }
            }
        }
        return ret;
    }

    private static double add(double v1, double v2) {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.add(b2).doubleValue();
    }
}