Abstract class..

[Preethi Dev]

Hi,
Can we declare an inner class in abstract class?. i tried this and it complies,but i couldnt able to access that class.any way to access inner class? and what will be the use of doing so?
Here is the program which i tried it on my own...

abstract class AA
{
abstract void method();
class BB extends AA{
BB()
{
System.out.println("BB constr");
}
public void method()
{
System.out.println("method of BB");
}
}
}



class CC extends AA
{
CC()
{
System.out.println("CC contr");
}
public void method()
{
System.out.println("method of CC");
}

public static void main(String args[])
{
CC c=new CC();
c.method();
//what can be added here to access innerclas
}
}

Please correct me if this is senseless...

Thanks in advance

[Preethi Dev]

no response?...waiting for reply..

[Shwetha Sharma]

Hi Preetha,
We can do that by creating an instance anonymous subclass of the abstract class which could be used to access the inner class

abstract class AA
{
abstract void method();
class BB extends AA{
BB()
{
System.out.println("BB constr");
}
public void method()
{
System.out.println("method of BB");
}
}
}



class CC extends AA
{
CC()
{
System.out.println("CC contr");
}
public void method()
{
System.out.println("method of CC");
}

public static void main(String args[])
{
CC c=new CC();
c.method();
//Code added to access innerclass
AA aa = new AA(){void method(){}}; //Here aa is the instance of anonymous subclass of Abstract Class AA
AA.BB bb = aa.new BB(); //bb is an instance of the inner class
bb.method();

}
}

[patrick avery]

Good question!!

This works as well:

CC.BB b = c.new BB();
b.method();

Thanks, Pat

[Preethi Dev]

Thanks to you both
now i got two ways to solve this.