ECC　Concept Rule Generation

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class Zuhe  {

    public static void main(String[] args) throws Exception {
        Zuhe zhuhe = new Zuhe();
        zhuhe.printAll("1,2/9,3,4/10,5/6/7/8");
    }

    /**
     *
     */
    public void printAll(String input) throws Exception {
        String[] elementArray = input.split(",");
        Map<String, String[]> elementAlias = new HashMap<String, String[]>();
        int length = elementArray.length;
        for (int i = 0; i < length; i++) {
            if (elementArray[i].indexOf("/") > 0) {
                String[] alias = elementArray[i].split("/");
                elementArray[i] = alias[0];
                String[] aliasArray = new String[alias.length - 1];
                System.arraycopy(alias, 1, aliasArray, 0, alias.length - 1);
                elementAlias.put(alias[0], aliasArray);
            }
        }
        List<String[]> result = new ArrayList<String[]>();
        for (int i = 2; i <= length; i++) {
            result.addAll(combine(elementArray, i));
        }
        result = processAlias(result,elementAlias);
        print(result);
    }

    public List<String[]> combine(String[] elements, int m) throws Exception {
        int n = elements.length;
        if (m > n) {
            throw new Exception("m>n");
        }

        List<String[]> result = new ArrayList<String[]>();


        int[] bs = new int[n];
        for (int i = 0; i < n; i++) {
            bs[i] = 0;
        }
        // 
        for (int i = 0; i < m; i++) {
            bs[i] = 1;
        }
        if (m == n) {
            result.add(print(bs, elements, m));
            return result;
        }
        boolean flag;
        boolean tempFlag;
        int pos;
        int sum;
        // 10 ， 01， 1 
        do {
            sum = 0;
            pos = 0;
            tempFlag = true;
            result.add(print(bs, elements, m));

            for (int i = 0; i < n - 1; i++) {
                if (bs[i] == 1 && bs[i + 1] == 0) {
                    bs[i] = 0;
                    bs[i + 1] = 1;
                    pos = i;
                    break;
                }
            }
            // 1 

            for (int i = 0; i < pos; i++) {
                if (bs[i] == 1) {
                    sum++;
                }
            }
            for (int i = 0; i < pos; i++) {
                if (i < sum) {
                    bs[i] = 1;
                } else {
                    bs[i] = 0;
                }
            }

            // 1 
            for (int i = n - m; i < n; i++) {
                if (bs[i] == 0) {
                    tempFlag = false;
                    break;
                }
            }
            flag = !tempFlag;

        } while (flag);
        result.add(print(bs, elements, m));

        return result;
    }

    private String[] print(int[] bs, String[] a, int m) {
        String[] result = new String[m];
        int pos = 0;
        for (int i = 0; i < bs.length; i++) {
            if (bs[i] == 1) {
                result[pos] = a[i];
                pos++;
            }
        }
        return result;
    }

    private void print(List<String[]> l) {
        for (String[] a : l) {
            for (String anA : a) {
                System.out.print(anA + " ");
            }
            System.out.println();
        }
    }

    private List<String[]> processAlias(List<String[]> l, Map<String, String[]> alias) {
        List<String[]> result = new ArrayList<String[]>();
        result.addAll(l);
        for (String[] a : l) {
            for (int i = 0; i < a.length; i++) {
                if (alias.containsKey(a[i])) {
                    String[] aliasArray = alias.get(a[i]);
                    for (String aliasElement : aliasArray) {
                        String[] b = new String[a.length];
                        System.arraycopy(a, 0, b, 0, a.length);
                        b[i] = aliasElement;
                        result.add(b);
                    }
                }
            }
        }
        return result;
    }
}