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);
}
}