Inner class and nested Static Class in Java with Example

Inner class and nested static class in Java both are classes declared inside another class, known as top level class in Java. In Java terminology, If you declare a nested class static, it will called nested static class in Java while non-static nested classes are simply referred as Inner Class. Inner classes are also a popular topic in Java interviews. One of the popular questions is the difference between inner class and nested static class , some time also referred to as a difference between static and non static nested class in Java. One of the most important questions related to nested classes are Where should you use nested class in Java?
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Why use Underscore in Numbers from Java? Underscore in Numeric Literals Example

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