//: Bits.java // Demonstration of BitSet import java.util.*;
public class Bits { public static void main(String[] args) { Random rand = new Random(); // Take the LSB of nextInt(): byte BT = (byte)rand.nextInt(); BitSet bb = new BitSet(); for(int i = 7; i >=0; i--) if(((1 << i) & bt) != 0) bb.set(i); else bb.clear(i); System.out. printBitSet(bb);
short st = (short)rand.nextInt(); BitSet bs = new BitSet(); for(int i = 15; i >=0; i--) if(((1 << i) & st) != 0) bs.set(i); else bs.clear(i); System.out.println("short value: " + st); printBitSet(bs);
int it = rand.nextInt(); BitSet bi = new BitSet(); for(int i = 31; i >=0; i--) if(((1 << i) & it) != 0) bi.set(i); else bi.clear(i); System.out.println("int value: " + it); printBitSet(bi);
// Test bitsets >= 64 bits: BitSet b127 = new BitSet(); b127.set(127); System.out.println("set bit 127: " + b127); BitSet b255 = new BitSet(65); b255.set(255); System.out.println("set bit 255: " + b255); BitSet b1023 = new BitSet(512); // Without the following, an exception is thrown // in the Java 1.0 implementation of BitSet: // b1023.set(1023); b1023.set(1024); System.out.println("set bit 1023: " + b1023); } static void printBitSet(BitSet b) { System.out.println("bits: " + b); String bbits = new String(); for(int j = 0; j < b.size() ; j++) bbits += (b.get(j) ? "1" : "0"); System.out.println("bit pattern: " + bbits); } } ///:~
