Web Reference: Mar 9, 2026 · The final keyword is a non-access modifier used to restrict modification. It applies to variables (value cannot change) methods (cannot be overridden) and classes (cannot be extended). The final keyword is a non-access modifier used for classes, attributes and methods, which makes them non-changeable (impossible to inherit or override). The final keyword is useful when you want a variable to always store the same value, like PI (3.14159...). The final modifier enforces an initialization of your reference by the time the call to your constructor completes (i.e. you must initialize it in the constructor).
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