Setting outer variable from anonymous inner class

Question

Is there any way to access caller-scoped variables from an anonymous inner class in Java?

Here\'s the sample code to understand what I need:

public L         


        

Answer 1

Long is immutable. If you use a mutable class, holding a long value, you can change the value. For example:

public class Main {

public static void main( String[] args ) throws Exception {
    Main a = new Main();
    System.out.println( a.getNumber() );
}

public void doWork( Work work ) {
    work.doWork();
}


public Long getNumber() {
    final LongHolder result = new LongHolder();
    doWork( new Work() {
        public void doWork() {
            result.value = 1L;
        }
    } );
    return result.value;
}

private static class LongHolder { 
    public Long value; 
}

private static abstract class Work {
    public abstract void doWork();
}

}