Java Interview Guide : 200+ Interview Questions and Answers - Final method, variable and class

The video tutorial explains the use of the final modifier in Java. It covers how the final modifier can be applied to classes, methods, variables, and arguments. The final modifier on a class prevents subclassing, ensuring immutability and security. When applied to methods, it prevents overriding, maintaining core logic. For variables, it makes them constants, and for arguments, it prevents modification. Examples from the Java API, like the String and Integer classes, illustrate these concepts.

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