Abstract Inner class

[Abhi vijay]

How can i make Inner class abstract? In the code given below it gives Compiler error as abstract class cannot be instantiated. Then what is the right way of doing it??

 
public class Outer2
{
  abstract class Inner
  {
    public void get()
    {
      System.out.println("INNER");
    }
  }
 
 
  public static void main(String[] args)
  {
    Outer2.Inner i = new Outer2().new Inner();
    i.get();
  }
}

( Jesper Young: Added code tags )
[ December 15, 2008: Message edited by: Jesper Young ]

[subhasish nag]

Here you are creating an object of abstract class

 Outer2.Inner i = new Outer2().new Inner();
   

[ December 15, 2008: Message edited by: subhasish nag ]

[Punit Singh]

You cannot instantiate abstract inner class here, you have to make anonymous subclass of the inner class, just do one change in your main() method.

  public static void main(String[] args)
{
Outer2.Inner i = new Outer2().new Inner(){

};
i.get();
}  

[Lidija Sketa]

You cannot instantiate abstract class. You have to extend it and implement its methods.

You can do it like this:

    
    public static void main(String[] args)
    {
        Outer2.Inner i = new Outer2().new Inner() {
            public void get() {
                System.out.println("Overrided");
            }
        };
        i.get();
    }

[Lidija Sketa]

Right, Punit is correct.

No need to implement the method since it is not abstract.

[alex sandoval]

Remember that Abstract classes cannot be instantiated even though they are not inner classes. You should create a concrete or non-abstract class to that extends your abstract class. For example using your code we would like to have something like this:

 
public class Outer2 {
  abstract class Inner {
    public void get() {
      System.out.println("INNER");
    }
  }
  class Inner2 extends Inner {}
 
 
  public static void main(String[] args) {
    Outer2.Inner i = new Outer2().new Inner2();
    i.get();
  }
}

( Jesper Young: Added code tags )
[ December 15, 2008: Message edited by: Jesper Young ]

[Jesper de Jong]

Please use code tags when you post code.