An inner class in Java is a class that is defined within the body of another class. It has access to the members (fields and methods) of the outer class, even if they are declared private. Inner classes can be used to logically group classes that are only used in one place, increasing the encapsulation and readability of the code. There are four types of inner classes in Java: 1. **Non-static Inner Class**: These are tied to an instance of the outer class.
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