如何从外部类的主方法调用异常类的方法

Question

I'm new to Java and is trying to learn the concept of anonymous class. Could someone please tell me how I can invoke the 'awesomeMethod' from the main method of the LocallClassExample?

public class LocalClassExample {

    interface Awesome {

        public void awesomeMethod();
    }

    class AwesomeClass {

        public int finalInt= 10;

        Awesome a1 = new Awesome() {

            @Override
            public void awesomeMethod() {
                System.out.println(finalInt);
            }
        };
    }

    public static void main(String[] args) {        

    }
}

Answer 1

Consider this:

new AwesomeClass().a1.awesomeMethod();

will invoke the method awesomeMethod() on the member variable a1 (which is something Awesome ) of the newly created instance of AwesomeClass .

It will get more tricky once your main is outside of your AwesomeClass - and more so once it's outside of the package. In these cases you'd have to provide a getter like

public Awesome getAwesome() { 
  return a1; 
}

Which would when invoked still execute the method as defined in your anonymous class.

Answer 2

Try to use this to create inner class object as:

  public static void main(String[] args) {        
    LocalClassExample.AwesomeClass oi = new LocalClassExample().new AwesomeClass();
  oi.awesomeMethod();
}