Inner Local Classes in Java

Question

public class Main {
    public static void main(String[] args) {
        int b=1;
        final int c=2; 
        String s1[] = new String[]{"A","B","C"};

        class InnerMain{                                    
            int a=5;

            public void show(){ 
                System.out.println(s1[0]);
                System.out.println("A:" + a);
                System.out.println("B:" + b);
                System.out.println("C:" + c);
            }
        }

        InnerMain test =new InnerMain();
        test.show();
    }
}

The book I have studied says that a local class can use just final variables and references of method that local class is in. İn this example, I used variable b that isn't final or reference. It ran and I didn't get any error. How? Can someone explain this behavior?

possible duplicate of [Difference between final and effectively final](http://stackoverflow.com/questions/20938095/difference-between-final-and-effectively-final) — DavidPostill, Mar 03 '15 at 06:30

score 5 · Accepted Answer · edited May 23 '17 at 12:12

5

Your book is probably outdated. Since Java 8 you can use effectively final local variables.

If you tried to change b anywhere before, after, or in the local class definition, you'd get a compiler error.

edited May 23 '17 at 12:12

Community

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answered Feb 08 '15 at 23:14

Sotirios Delimanolis

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thanks for your answer.And, how can ı follow news about java update? – Furkan Feb 08 '15 at 23:24
@Furkan [This](https://www.oracle.com/java/index.html) is the official Oracle page. – Sotirios Delimanolis Feb 08 '15 at 23:27

Inner Local Classes in Java

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