Method Local Inner Class Question

[Arjun Reddy]

Hi,

I did not understand the following sentence from Kathy Sierra Book.

A method-local inner class cannot use variables declared within the method
(including parameters) unless those variables are marked final.

I wrote a sample code as below.

   package com.gss.methodlocalinnerclass;
public class OuterClass {
 
final public int j=10;  


final int someMethod222()
{
return 2;
}
public static void main(String[] args) {
final int a=10;
class Inner
{
void someMethod(){
System.out.println(OuterClass.this.j); 
//System.out.println(OuterClass.this.a); 
//System.out.println(OuterClass.this.someMethod222()); 
}
}
Inner obj = new Inner();
obj.someMethod();
 

}
 
}
 

According to the above sentence from kb book, I made variable 'a' final but I cannot access it. I can only access the variable 'j' if it's final, but then again, I cannot access the method someMethod222() even if it's marked final?

Thanks.
[ September 19, 2008: Message edited by: Arjun Reddy ]

[Campbell Ritchie]

Maybe because you are calling "OuterClass.this" when the "a" is a local variable, not an instance field.

[Campbell Ritchie]

. . . and you can't usually use the keywords "this" and "super" in a static method because both keywords refer to instances.

[Arjun Reddy]

Hi Campbell,

Thanks for replying. Can you give me a code sample of what this means exactly?

A method-local inner class cannot use variables declared within the method
(including parameters) unless those variables are marked final.

Thanks.

[Henry Wong]

Did you try....

 System.out.println(a);    

Henry

[Arjun Reddy]

Okie... it worked. Thanks Campbell and Henry
[ September 19, 2008: Message edited by: Arjun Reddy ]