一个集合的所有子集的Java代码实现

import java.io.*;public class dddde {public void displaySubSet(int setN[]) {int length = setN.length;int i;try {BufferedWriter writer = new BufferedWriter(new FileWriter(new File("d://Result.txt")));for (i = 0; i < (1 << length); i++) {for (int j = 0; j < length; j++) {if ((i & (1 << j)) != 0) {writer.write("" + setN[j] + " ");}}writer.write("/r/n");}writer.close();} catch (Exception e) {}}public static void main(String[] args) {dddde ss = new dddde();int setN[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };ss.displaySubSet(setN);}}