How to call inner class method from static main() method - No static class

[agilemanoj kumar]

Hi,
I have an inner class(It is not a static class, just plain inner class) inside an outer class given below:

 public class outerClass {
 	
 	class innerClass {
 		public void display(){
 			System.out.println("In Inner class...");
 		}
 	}
 	
 	public static void main(String[] args) {
 		// Do something here so that it calls display() method...
 	}
 
}

I would want to call display() method from static void main() method.
Coditions:
1. Do not insert/delete any code written above.
2. We have a flexibility to add any number of lines in main() method

How can we do that?

--
Thanks,
Manoj Kumar

[Darryl Burke]

Homework?

I'll give you a hint: an instance of a non-static inner class can only exist in the context of an instance of the containing class.

edit I'll also give you a word of advice: By convention, class names start with an uppercase letter.

[agilemanoj kumar]

  public class OuterClass {
 	
 	class InnerClass {
 		public void display(){
 			System.out.println("In Inner class...");
 		}
 	}
 	
 	public static void main(String[] args) {
 		
 		OuterClass oc = new OuterClass();
 		
 		//OuterClass.InnerClass ic = new oc.InnerClass();
 		//OuterClass.InnerClass ic = new OuterClass.InnerClass();
 		//OuterClass.InnerClass ic = ???? What to put
 	}
 
}

I tried adding these two statements in main() method. But, it is giving me compile time error. What am I doing wrong??

--
Thanks,
Manoj Kumar

[Pramod P Deore]

create inner class object as

OuterClass.InnerClass oi = new OuterClass().new InnerClass(); 

then call inner class method

[agilemanoj kumar]

Thank you very much

[Darryl Burke]

If you need to retain references to both the instances of outerClass and innerClass:

outerClass oc = new outerClass();
innerClass ic = oc.new innerClass();

Note that since the code is within the class scope of outerClass, you don't need to fully qualify the name of innerClass. Pramod's code can also be written as

innerClass ic = new outerClass().new innerClass();