K&B Chapter8-Inner classes-Q 8

[Maya Karthik]

Hi,

Can anybody please explain the working of the below code?not clear with the syntax " (new Bar() {}).go();"

public class Foo {
Foo() {System.out.print("foo");}
class Bar{
Bar() {System.out.print("bar");}
public void go() {System.out.print("hi");}
}
public static void main(String[] args) {
Foo f = new Foo();
f.makeBar();
}
void makeBar() {
(new Bar() {}).go();
}
}

Thank you
Maya

[vijay saraf]

it is nothing else than 'Anonymous Inner Class'...
you are creating a sub class of Bar at runtime ( obviously it is not having any name and not overriding go() method)
so when you say
(new Bar(){}) is creation of subclass and its instance as well...
and when you call go() method over that instance , the go method of parent will be called...
again if you have putted as bellow

(new Bar(){ 
 public void go() {System.out.print("hi 'Anonymous ");} 
}) .go()

then new overridden method would be called

[Maya Karthik]

Thank you very much Vijay.I got it.