Java.Streams.Which classes support reading and writing streams in compressed format?

Great one, Stanley! 😎 In Java, working with compressed streams (like ZIP or GZIP) is well-supported — especially for reading/writing data on-the-fly in a compressed format.

Here are the key classes you’ll want to know:

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🗜️ Classes for Reading/Writing Compressed Streams

Class	Package	Purpose
GZIPInputStream	java.util.zip	Reads data from a GZIP-compressed input stream
GZIPOutputStream	java.util.zip	Writes data to a stream in GZIP format
ZipInputStream	java.util.zip	Reads ZIP archive entries sequentially
ZipOutputStream	java.util.zip	Writes ZIP archive entries
InflaterInputStream	java.util.zip	Reads data compressed with DEFLATE
DeflaterOutputStream	java.util.zip	Writes data in DEFLATE format
JarInputStream	java.util.jar	Reads JAR files (which are ZIP + manifest)
JarOutputStream	java.util.jar	Writes JAR files

✅ GZIP Example

import java.io.*;
import java.util.zip.*;

public class GzipExample {
    public static void main(String[] args) throws IOException {
        // Compress
        try (FileOutputStream fos = new FileOutputStream("data.gz");
             GZIPOutputStream gzipOut = new GZIPOutputStream(fos);
             OutputStreamWriter writer = new OutputStreamWriter(gzipOut)) {
            writer.write("Hello, compressed world!");
        }

        // Decompress
        try (FileInputStream fis = new FileInputStream("data.gz");
             GZIPInputStream gzipIn = new GZIPInputStream(fis);
             InputStreamReader reader = new InputStreamReader(gzipIn);
             BufferedReader br = new BufferedReader(reader)) {
            System.out.println("Decompressed: " + br.readLine());
        }
    }
}

✅ ZIP Example (Multiple Entries)

try (ZipOutputStream zos = new ZipOutputStream(new FileOutputStream("archive.zip"))) {
    ZipEntry entry = new ZipEntry("hello.txt");
    zos.putNextEntry(entry);
    zos.write("Hello from ZIP!".getBytes());
    zos.closeEntry();
}

🧵 TL;DR

Format	For Reading	For Writing
GZIP	GZIPInputStream	GZIPOutputStream
ZIP	ZipInputStream, JarInputStream	ZipOutputStream, JarOutputStream
DEFLATE	InflaterInputStream	DeflaterOutputStream

These classes wrap around InputStream/OutputStream, so you can use them in stream chains like with BufferedReader, PrintWriter, etc.