import java.util.BitSet;
public class BitSetDemo {
public static void main(String[] args) {
// Create a BitSet with 16 bits
BitSet bs = new BitSet(16);
// Set bits at positions 3, 5, 11, and 14
bs.set(3);
bs.set(5);
bs.set(11);
bs.set(14);
// Print the BitSet as a binary string
System.out.println(getBinaryString(bs, 16));
// Find and print the first set bit
int firstSetBit = bs.nextSetBit(0);
System.out.println("First set bit at index: " + firstSetBit);
// Print all set bit indexes
System.out.println("All the set bits indexes:");
for (int i = bs.nextSetBit(0); i >= 0; i = bs.nextSetBit(i + 1)) {
System.out.print(i + " ");
}
}
// Helper method to print BitSet as a binary string
private static String getBinaryString(BitSet bs, int size) {
StringBuilder sb = new StringBuilder();
for (int i = size - 1; i >= 0; i--) {
sb.append(bs.get(i) ? '1' : '0');
}
return sb.toString();
}
}
/*
run:
0100100000101000
First set bit at index: 3
All the set bits indexes:
3 5 11 14
*/
