How do I Read this?

[Amit Batra]

from the k&b
void makeBar() {
(new Bar(){}).go();
}
Is this is method local inner class or an anonymous class? If its anonymous how is it being declared inside a method? what exactly is going on here?

[Neelesh Bodas]

Adding some code around the fragment that you have given, to give it some contextual meaning

class Bar
{
    public void go()
    {
System.out.println("I am here");
    }
}
 

class Sample
{
    void makeBar() 
    {
(new Bar(){}).go();
    }
    
    public static void main(String[] args)
    {
Sample s = new Sample();
s.makeBar();
    }
}

Observe that inside the makebar() method, we are creating an anonymous inner class, which is the subclass of class Sample. This inner class doesnot override any methods from the superclass. And then we just call the go() method on the newly created instance.

[Douglas Chorpita]

The anonymous class is a subclass of the class Bar, not the class Sample.

[Ramamoorthy Periasamy]

 [B]abstract[/B] class Bar{    public void go()    {System.out.println("I am here");    }} class Sample{    void makeBar()     {(new Bar(){}).go();    }        public static void main(String[] args)    {Sample s = new Sample();s.makeBar();    }}
   

class Bar might have declared as abstract to be more appropriate. Then only its a worth creating a anonymous class (which is a subclass of Bar).

[Neelesh Bodas]

Originally posted by Douglas Chorpita:
The anonymous class is a subclass of the class Bar, not the class Sample.

Yes, True, Typo on my part. Thanks for pointing out.