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Java Basic

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Java String Methods

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Java Math Methods

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Java Output Methods

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Java ArrayList Methods

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Java LinkedList Methods

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Java HashMap Methods

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Java Errors and Exception

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Text lesson

final

Example

Declare a variable as final to prohibit its override or modification.

public class Main {
final int x = 10;

public static void main(String[] args) {
    Main myObj = new Main();
    myObj.x = 25; // will generate an error:cannot assign a value to a final variable
    System.out.println(myObj.x);
}
}

Definition and Usage

The final keyword, as a non-access modifier, applies to classes, attributes, and methods, rendering them immutable and uninheritable or unoverridable.

The final keyword is beneficial when you require a variable to consistently retain a specific value, such as PI (3.14159…).

The final keyword is categorized as a “modifier,” a concept you’ll delve deeper into in the Java Modifiers Chapter.