CODEWITHSUNDEEP
javaclasstestingassertnested-class
user3677898
user3677898

Reputation: 27

How to access inner class in Java (while in assert)

I have code here that creates a nested class, and then checks to see if a value is there. Answer goes where [???] is currently, the code given to me can't be changed.

   //The answer must have balanced parentesis
class A{
  class C{
    int foo(){return 42;}
  }
}
public class Exercise{

  public static void main(String [] arg){
   assert ([???].foo()==42);
  }
}

The question: how do I access the foo() method within C (which is within A)?

Upvotes: 0

Views: 383

Answers (2)

Shailesh Aswal
Shailesh Aswal

Reputation: 6802

dimoniy is correct.

you can also do:

A.C c = new A().new C();

assert (c.foo() == 42);

Upvotes: 0

dimoniy
dimoniy

Reputation: 5995

In order to run a non-static method of class C, you need to create an instance of C,but C is non-static inner class of A and hence you need to create an instance of A before you can create C. So, to create A:

A a = new A();

To create C:

C c = a.new C();

To invoke method foo

c.foo()

All in one line:

new A().new C().foo()

Upvotes: 3

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