The Java JAR file uses a standard compression algorithm used by all of the most popular tools. A Java JAR file is really just a ZIP file with a .jar extension. How do I extract the contents of a JAR ...

Whether or not an exception is handled, you may need to perform cleanup tasks, such as closing an open file. Java provides the finally block for this purpose.

The second file’s automatic cleanup is achieved by the more traditional File.deleteOnExit() method that I have previously discussed in the blog post Java’s File.deleteOnExit() in Groovy.

The following command enables you to run any Java JAR file on the command line: java -jar jarfilename.jar. To use the JAR file opener that comes when you install Java with the JDK, just issue the ...