public class GZIPOutputStream extends DeflaterOutputStream
| Modifier and Type | Field and Description | 
|---|---|
| protected CRC32 | crcCRC-32 of uncompressed data. | 
buf, defout| Constructor and Description | 
|---|
| GZIPOutputStream(OutputStream out)Creates a new output stream with a default buffer size. | 
| GZIPOutputStream(OutputStream out,
                boolean syncFlush)Creates a new output stream with a default buffer size and
 the specified flush mode. | 
| GZIPOutputStream(OutputStream out,
                int size)Creates a new output stream with the specified buffer size. | 
| GZIPOutputStream(OutputStream out,
                int size,
                boolean syncFlush)Creates a new output stream with the specified buffer size and
 flush mode. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | finish()Finishes writing compressed data to the output stream without closing
 the underlying stream. | 
| void | write(byte[] buf,
     int off,
     int len)Writes array of bytes to the compressed output stream. | 
close, deflate, flush, writewriteprotected CRC32 crc
public GZIPOutputStream(OutputStream out, int size) throws IOException
The new output stream instance is created as if by invoking the 3-argument constructor GZIPOutputStream(out, size, false).
out - the output streamsize - the output buffer sizeIOException - If an I/O error has occurred.IllegalArgumentException - if size <= 0public GZIPOutputStream(OutputStream out, int size, boolean syncFlush) throws IOException
out - the output streamsize - the output buffer sizesyncFlush - if true invocation of the inherited
        flush() method of
        this instance flushes the compressor with flush mode
        Deflater.SYNC_FLUSH before flushing the output
        stream, otherwise only flushes the output streamIOException - If an I/O error has occurred.IllegalArgumentException - if size <= 0public GZIPOutputStream(OutputStream out) throws IOException
The new output stream instance is created as if by invoking the 2-argument constructor GZIPOutputStream(out, false).
out - the output streamIOException - If an I/O error has occurred.public GZIPOutputStream(OutputStream out, boolean syncFlush) throws IOException
out - the output streamsyncFlush - if true invocation of the inherited
        flush() method of
        this instance flushes the compressor with flush mode
        Deflater.SYNC_FLUSH before flushing the output
        stream, otherwise only flushes the output streamIOException - If an I/O error has occurred.public void write(byte[] buf,
                  int off,
                  int len)
           throws IOException
write in class DeflaterOutputStreambuf - the data to be writtenoff - the start offset of the datalen - the length of the dataIOException - If an I/O error has occurred.FilterOutputStream.write(int)public void finish()
            throws IOException
finish in class DeflaterOutputStreamIOException - if an I/O error has occurred Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
 Copyright © 1993, 2025, Oracle and/or its affiliates.  All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.