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Java source code examples - small, running programs

This section contains small programs with source code to demonstrate how to use the Java runtime library.

Image file code examples

Programs that read and write image files, sometimes modifying the images.

File I/O

• CopyFile.java — copy a file to another directory, optionally verify it, clock the process, ask the user in case a file exists already and change the timestamp to the one of the original file.
• DupeFinder — in directory tree(s), find out which files store the same content, using checksums.
• WordCount.java — count words, lines and characters in text files.

Networking

• FileDownload.java — download files from the Web.
• Geolocation — determine location information for given IP addresses.

GUI code examples

Working with Java's built-in graphical user interface (GUI).

• HappyNewYear.java - Count down in a fullscreen window