compression : Java Glossary

Since data communication lines are so slow, it is important to use every possible scheme to use them efficiently. Compression schemes can reduce the amount of data that needs to be sent. The receiver fluffs the data back up to its original size. Compression schemes depend on the fact that most messages repeat words or phrases and use some letters of the alphabet more frequently than others. Compressors invent a scheme of short abbreviations for commonly used items.

Java Compression Classes	Learning More
Standalone Compression Utilities	Links

Java Compression Classes

The GZIPOutputStream/GZipInputStream compress entire files, not a file of members in Zip format. Other classes of interest include Deflater/ Inflater, DeflaterOutputStream/ InflaterInputStream, ZipEntry, ZipException, ZipFile, ZipInputStream, ZipOutputStream and Adler32 (for quick checksums);

Learning More

Sun’s Javadoc on ZipFile class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on ZipEntry class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on ZipInputStream class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on ZipOutputStream class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on GZIPInputStream class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on GZIPOutputStream class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on Inflater class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on Deflater class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on InflaterInputStream class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on DeflaterOutputStream class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

Sun’s Javadoc on Adler32 class : available:

on the web at java.sun.com
in the current JDK 1.6.0_17 or in the old JDK 1.5.0_22 on your local Windows J: drive.

7-Zip
archive
bzip2
compression utilities
GZIP
Huffman encoding
jar.exe
Pack200.exe
PKZIP
WinRar
WinZip
Zip

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