Difference Between Static And Final Keyword In Java
distinguishing static and final keywords in java
Difference Between Static And Final Keyword In Java
In Java, the `static` keyword is used to define a class-level variable or method that belongs to the class itself rather than to any specific instance of the class. This means that a `static` variable or method can be accessed using the class name without creating an instance of the class. On the other hand, the `final` keyword is used to define constants and immutable variables that cannot be changed or overridden once they have been initialized. In essence, `static` is used to define properties or methods that are shared among all instances of a class, while `final` is used to define constants and variables that are meant to remain constant throughout the program's execution.
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1 - The ‘static’ keyword in Java is used to denote that a particular field or method belongs to the class itself, rather than to any specific instance of the class. It can be accessed using the class name and does not require an object instance to be created. On the other hand, the ‘final’ keyword in Java is used to define a constant value that cannot be changed once it has been initialized.
2) When a field is declared as ‘static’, it belongs to the class and is shared among all instances of that class. Any changes made to a static field will be reflected across all instances. In contrast, a variable declared as ‘final’ is a constant and its value cannot be altered once it has been assigned.
3) Static methods are associated with the class itself and can be called without an instance of the class being created. They are typically used for utility functions that do not require any specific instance data. Final methods, on the other hand, cannot be overridden by subclasses.
4) Both static and final keywords can be used in the context of classes, methods, and variables. A class declared as ‘static’ is a nested class that belongs to the outer class, while a class declared as ‘final’ cannot be extended.
5) In terms of memory allocation, static variables are allocated memory once when the class is loaded into the memory, while final variables are initialized memory when an object is created and remains constant throughout the object's lifetime.
6) Using the ‘static’ keyword allows for the creation of class level variables and methods that can be accessed globally within the program. Conversely, using the ‘final’ keyword ensures immutability and helps in creating constants that cannot be modified.
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