How to automatically backup files and directories in Linux using tar to archive and cron jobs.

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log4j.properties basic examples. Output to the console and to the file.

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Log4j Logging Levels explained. For the standard levels, this is the order: ALL

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How to send emails using JavaMail. Simple example using a gmail account and proxy settings if needed.

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Java 8 forEach examples. Map and list loop using lambda, method reference, stream and filter.

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How to sort objects with Comparable and Comparator in Java. Primitive array and list sorting. Java Object sorting with Comparable and Comparator.

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