Java final Keyword
Example
Set a variable to final, to prevent it from being overridden/modified:
public class MyClass {
final int x = 10;
public static void main(String[] args) {
MyClass myObj = new MyClass();
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 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 keyword is called a "modifier". You will learn more about these in the Java Modifiers Chapter.
Related Pages
Read more about attributes our Java Class Attributes Tutorial.
