Core Java


            import java.io.*;
/**
* BinCat is a simple class for reading bytes and 
* writting them back out in binary representation.
*/
 public class BinCat {
 BufferedInputStream brIn;
 PrintStream psOut;
 public static int BYTES_PER_LINE = 4;
 public BinCat() {
 this(System.in,System.out);
 }
 public BinCat(InputStream in, OutputStream out) {
 brIn = new BufferedInputStream(in);
 if (out instanceof PrintStream)
 psOut = (PrintStream)out;
 else
 psOut = new PrintStream(out);
 }
 public void doit() {
 int ch, cv, bit, cnt;
 try {
 for(cnt = 0, ch = brIn.read(); ch >= 0; ch = brIn.read()) {
 cv = ((int)ch & 0x00ff);
 for(bit = 7; bit >= 0; bit--) {
 if ((cv & (2 << bit)) > 0)
 psOut.print("1");
 else
 psOut.print("0");
 }
 cnt++;
 if ((cnt % BYTES_PER_LINE) == 0) 
 psOut.println("");
 }
 } catch (IOException e) { }
 return;
 }
 /**
 * Test main for BinCat 
 */
 public static void main(String args[]) {
 BinCat kitty;
 kitty = new BinCat();
 kitty.doit();
 System.exit(0);
 }
}