import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.DeflaterOutputStream;
public class FileDeflater {
public static void main(String[] args) throws Exception {
FileInputStream fin = new FileInputStream("a.dat");
FileOutputStream fout = new FileOutputStream("b.dat");
DeflaterOutputStream dos = new DeflaterOutputStream(fout);
for (int c = fin.read(); c != -1; c = fin.read()) {
dos.write(c);
}
dos.close();
fin.close();
}
}