array of BitSet

package ch.claude_martin.playground;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.BitSet;
import java.util.List;
import java.util.stream.Collectors;

public class SomeClass {

    public static void main(String[] args) throws IOException {
        String path = "matrix.txt";
        List<BitSet> matrix = Files.lines(Paths.get(path), StandardCharsets.US_ASCII).map(l -> parseLine(l))
                .collect(Collectors.toList());
        // ...
    }

    static BitSet parseLine(String line) {
        String[] a = line.split("\\s+");
        final BitSet bs = new BitSet(a.length);
        for (int i = 0; i < a.length; i++) {
            if (Integer.parseInt(a[i]) == 1)
                bs.set(i);
        }
        return bs;
    }

}