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

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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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How to make a file read-only in Java. Simple example using File.setReadOnly() and File.setWritable(boolean) methods.

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How to copy a directory and all sub-directories or files in Java. The recursive method used to traverse all the subdirectories.

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How to display the content of a directory in Java. Recursive method used to display all the sub-folders structure.

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