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Reference: Non-Printable Characters List

Non-printable characters on Linux, macOS, or Windows are characters that do not represent a symbol, character, or number that is part of the document's text, but rather are used for things like character encoding. A full list of all non-printable characters along with their decimal and hexidecimal codes are shown below.

How to Find Non-Printable Characters in a File

If you need to see all nonprintable characters in a document, you can use cat -v filename.txt in terminal to find them, where filename.txt is the file you want to show. The contents of the file, along with the non-printable characters in caret notation will be shown in your terminal window.

January 7, 2020

Java Concurrency: AtomicReference

Java.util.concurrent.atomic.AtomicReference is a class designed to update variables in a thread-safe way. Why do we need the class AtomicReference? Why can we not simply use a volatile variable? And how can we use it correctly?

Why AtomicReference?

For the tool I am writing, I need to detect if an object was called from multiple threads. I use the following immutable class for this:

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