Prefer TimeUnit Sleep over Thread.Sleep - Java Coding Tips Example

What is TimeUnit in Java
TimeUnit in Java is a class on java.util.concurrent package, introduced in Java 5 along with CountDownLatch, CyclicBarrier, Semaphore, and several other concurrent utilities. TimeUnit provides a human-readable version of the Thread.sleep() method which can be used in place of the former. For a long time Thread's sleep() method is a standard way to pause a Thread in Java and almost every Java programmer is familiar with that. In fact, the sleep method itself is very popular and has appeared on many Java interviews. The difference between wait and sleep is one of the tough Java questions to answer. 
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Why use Underscore in Numbers from Java? Underscore in Numeric Literals Example

JDK 1.7 release had introduced several useful features, despite most of them being syntactic sugar, there use can greatly improve readability and code quality. One such feature is the introduction of underscores in numeric literals . From Java 7 onwards you can write a long digit e.g. 10000000000 to a more readable 1 0_000_000_000 in your Java source code. One of the most important reasons for using an underscore in numeric literal is avoiding subtle mistakes that are hard to figure out by looking at code. It's hard to notice a missing zero or extra zero between 10000000000 and 1000000000 , than 10_000_000_000 and 1_000_000_000 .
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