Why use method local abstract inner classes

Question

One of the legal modifiers you can use with method local inner classes is abstract.

For example:

public class Outer {
    public void method(){
        a         


        

Answer 1

I can think only in this case

class Outer {
    public void method() {
        abstract class A {
            void bar(){}
            abstract void foo();
        }
        class B extends A {
            @Override
            void foo() {
            }
        }
        final class C extends A {
            @Override
            void foo() {
            }
        }
        A a1 = new B();
        A a2 = new C();
    }
}

But I can't imagine real usage