import java.util.ArrayList;
import java.util.Scanner;
import org.apache.commons.collections.CollectionUtils;
/**
 * 输入一个集合，输出这个集合的所有子集
 * @author liangyongxing
 * @time 2017-02-06
 */
public class SubListExport {
 public static void main(String[] args) {
  ArrayList list = new ArrayList();
  System.out.println("请输入一串整数并在输入时用英文逗号隔开：");
  String inputString = new Scanner(System.in).next().toString();
  if (inputString != null && !inputString.isEmpty()) {
   String[] strArray = inputString.split(",");
   for (String str : strArray) {
    list.add(Integer.parseInt(str));
   }
   ArrayList> allsubsets = getSubsets(list); 
   for(ArrayList subList : allsubsets) {
    System.out.println(subList);
   }
  }
 }
 public static ArrayList> getSubsets(ArrayList subList) {
  ArrayList> allsubsets = new ArrayList>();
  int max = 1 << subList.size();
  for(int loop = 0; loop < max; loop++) {
   int index = 0;
   int temp = loop;
   ArrayList currentCharList = new ArrayList();
   while(temp > 0) {
    if((temp & 1) > 0) {
     currentCharList.add(subList.get(index));
    }
    temp>>=1;
    index++;
   }42    allsubsets.add(currentCharList);44   }
  return allsubsets;
 }
}