Anonymous inner classes : How to run their methods ?

[Rahul Sudip Bose]

The code below compiles. But how do i execute the methods of my anonymous inner classes ? The method name is public void main(){.....}
This code is only for learning, doesnt do anything useful.

class Dream
{
	Dream()
	{
	 System.out.println("Dream()");
	}

	Dream(String s)
	{
	 System.out.println("Dream(String)" + s); 
	}

	public void main(){System.out.println("The real dream");}
	
}

public class Anon extends Dream
{
	public static void main(String[]args)
	{ 
	  System.out.println("Inside the main of Anon !");
	  Dream d = new Dream()
	  {
	  //blank
	  };
	  
	  final String g = "haunted"; 
	  
	  Dream d1 = new Dream(g)   
	  {
	    String p = g + "at night"; 
		public void main()
		{
		 System.out.println("indide dream d of main of Anon" + p); // NEED THIS IN THE OUTPUT !
		}
	    
	  };
	 
	  Dream d2 = new Dream()
	  {
	   public void main(){System.out.println("Inside dream d2 of main of Anon");}  // NEED THIS IN THE OUTPUT !
	  }; 
	 
	}// MAIN ends

}//Anon ends

here is the current output :

Inside the main of Anon !
Dream()
Dream(String)haunted
Dream()

[Mohamed Sanaulla]

How do you other wise invoke the methods of an instance? In the anonymous inner class syntax- You are actually extending the Dream class and then creating an instance of that extended class.

[Rahul Sudip Bose]

how to run the println inside main() of the classes in main(String[] args) ?

[Mohamed Sanaulla]

Mohamed Sanaulla wrote:How do you other wise invoke the methods of an instance?

[Rahul Sudip Bose]

Ok, got it. Instances of the anonymous inner classes that extend a class (or implement an interface) can be accessed only by using a reference of the super-type (hope this makes sense).

This is the code :

Dream x = d;  // d1,d2 etc 
d.main(); //etc.

PS : so many rules to remember. Are there any condensed notes/flash-cards that help in remembering them ?

here is the code finally : dont try to make sense of the random strings

class Dream
{
	Dream(){}

	Dream(String s){}

	public void main(){System.out.println("The real dream");}
	
}

public class Anon extends Dream
{
	public static void main(String[]args)
	{ 
	  System.out.println("Inside the main of Anon !");
	  
	  Dream d = new Dream(){};
	  
	  final String g = " haunted "; 
	  
	  Dream d1 = new Dream(g)   
	  {
	    String p = g + " at night "; 
		public void main()
		{
		 System.out.println("inside dream d of main of Anon" + p);
		}

	  };
	 
	  Dream d2 = new Dream()
	  {
	   public void main(){System.out.println("Inside dream d2 of main of Anon");}
	  }; 
	  
	  Dream sleep = d;
	  sleep.main(); 	 
	  
	  sleep = d1;
	  sleep.main(); 

	  sleep = d2;
	  sleep.main(); 
	 
	}// MAIN ends

}//Anon ends

output :

Inside the main of Anon !
The real dream
inside dream d of main of Anon haunted  at night
Inside dream d2 of main of Anon

[Mohamed Sanaulla]

Rahul Sudip Bose wrote:
PS : so many rules to remember. Are there any condensed notes/flash-cards that help in remembering them ?

Practice would make you familiar with them. You can create your own notes/flash-cards and share it here There are a few notes available. You might find them in ScjpFaq You can google for "Jonathan Giles scjp notes"