What is the final keyword in Java?

Used on	Meaning
Variable	The value can be set only once (a constant)
Method	Can not be overridden in a subclass
Class	Can not be extended (for example `String` is final)
Parameter	Can not be changed inside the method

public class Final {
    public static void main(String[] args) {
        final int max = 10;
        max = 20;
    }
}

Output

Final.java:4: error: cannot assign a value to final variable max
max = 20;
^
1 error
error: compilation failed

A final reference can not point to another object, but the object itself can still change. See also final, finally and finalize.

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