Why anonumous inner class is not take the ";"

[Tanakorn Numrubporn]

This question is derive from SCJP5.0 K&B book.
Given:
1 public class Foo{
2 Foo(){System.out.print("foo");}
3 class Bar{
4 Bar() {System.out.print("bar");}
5 public void go(){System.out.print("hi");}
6 }
7 public static void main(String[] args){
8 Foo f = new Foo();
9 f.makeBar();
10 }
11 void makeBar(){
12 (new Bar() {}).go();
13 }
14 }

What is the result?
A. Compilation fails.
B. An error occurs at runtime.
C. foobarhi
D. barhi
E. hi
F. foohi

The answer is C. foobarhi

My question is;
At the line 12 why it not written to (new Bar() {};).go();
I think anonymous inner class must follow by ';' in the plain-old one and follow by ');' for argument anonymous. But, why this given code is not follow this rule.

[Sanjeev Singh]

Tanakorn,

I think anonymous inner class must follow by ';' in the plain-old one and follow by ');' for argument anonymous. But, why this given code is not follow this rule.

neither of the two cases you described applies here,in the above code a mehtod is being invoked on the anonymous class object.
[ January 09, 2007: Message edited by: Sanjeev Kumar Singh ]

[Tanakorn Numrubporn]

Thank you for reply
Can I make a conclusion that when we invoking method for Anonymous object, it not neccessary to add ';' behind '}' of that Anonymous object?

[Javier Sanchez Cerrillo]

More than necessary. It is mandatory that you don't put the semicolon.

[marc weber]

The semicolon simply marks the end of a statement, as always. It sometimes looks unusual in the context of an anonymous class, but it's not really any different.

For example, an anonymous class is often defined in a simple assignment statement, where the right side is basically a constructor call with the anonymous class body slipped in after the parentheses. But this is still just a statement, so it ends with a semicolon.

MyClass mc1 = new MyClass();
MyClass mc2 = new MyClass(){}; //anonymous body slipped in

It's also possible to create a new instance -- without assigning it to a variable -- for a one-time method call. An anonymous class body can be slipped in here as well. Of course, this is still just a statement, so it ends with a semicolon.

(new MyClass()).method();
(new MyClass(){}).method(); //anonymous body slipped in