Java Utililty Methods Zip Byte Array

ByteArrayOutputStream out = new ByteArrayOutputStream();
java.util.zip.GZIPOutputStream gout = new GZIPOutputStream(out);
gout.write(data);
gout.close();
return out.toByteArray();

if (bytes == null)
    return null;
if (bytes.length == 0)
    return new byte[0];
Deflater deflater = new Deflater();
deflater.setInput(bytes);
ByteArrayOutputStream out = new ByteArrayOutputStream(bytes.length);
deflater.finish();
...

byte[] b = null;
try {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    ZipOutputStream zip = new ZipOutputStream(bos);
    ZipEntry entry = new ZipEntry("zip");
    entry.setSize(data.length);
    zip.putNextEntry(entry);
    zip.write(data);
...

ByteArrayOutputStream out = new ByteArrayOutputStream();
DeflaterOutputStream dos = new DeflaterOutputStream(out);
dos.write(datas);
dos.close();
return out.toByteArray();

try {
    ByteArrayOutputStream byteOut = new ByteArrayOutputStream(in.length / EXPECTED_COMPRESSION_RATIO);
    GZIPOutputStream outStream = new GZIPOutputStream(byteOut);
    try {
        outStream.write(in);
    } catch (Exception e) {
        e.printStackTrace();
    try {
        outStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    return byteOut.toByteArray();
} catch (IOException e) {
    e.printStackTrace();
    return null;

if (input == null || input.length == 0) {
    return input;
try {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    GZIPOutputStream gzip = new GZIPOutputStream(out);
    gzip.write(input);
    gzip.close();
...

final Deflater compressor = new Deflater();
compressor.setLevel(Deflater.BEST_COMPRESSION);
compressor.setInput(input);
compressor.finish();
final ByteArrayOutputStream bos = new ByteArrayOutputStream(input.length);
byte[] buf = new byte[1024];
while (!compressor.finished()) {
    int count = compressor.deflate(buf);
...

ByteArrayOutputStream baos = new ByteArrayOutputStream();
Deflater deflater = new Deflater();
deflater.setInput(source);
deflater.finish();
byte[] buffer = new byte[BUFFER_SIZE_FOR_ZIP];
int writeByte = 0;
while ((writeByte = deflater.deflate(buffer)) != 0) {
    baos.write(buffer, 0, writeByte);
...

ByteArrayOutputStream baos = new ByteArrayOutputStream();
GZIPOutputStream zos = new GZIPOutputStream(baos);
zos.write(uncompressedBytes, 0, uncompressedBytes.length);
zos.close();
return baos.toByteArray();

Deflater compresser = new Deflater();
compresser.reset();
compresser.setInput(data);
compresser.finish();
byte result[] = new byte[0];
ByteArrayOutputStream o = new ByteArrayOutputStream(1);
try {
    byte[] buf = new byte[CacheSize];
...