No enclosing instance of type Hello is accessible

1.static keywords

• The decorated members are shared by all objects (including member variables and methods).
• A decorated member takes precedence over the existence of an object.
• stored in the static area of the method area (shared data area).
• Static methods can only access static members.
• The this or Super keyword cannot be used in a static method.
• The main function is static and can only call the static method.
• Static code blocks run as the class is loaded (once only). Used to initialize a class.

Q:

I have the following code:

   1:class Hello {

   2:     class Thing {

   3:          Public int size;

   4:

   5:         Thing () {

   6:             size = 0;

   7:         }

   8:     }

   9:

  Ten:      Public Static void Main (string[] args) {

One   :         New Thing ();

  :         System.out.println ("Hello, world!");

  :     }

  : }

It refuses to compile. I get at the No enclosing instance of type Hello is accessible." creates a new Thing.

A:

You ' ve declared the class Thing as a non-static inner class. That means it must is associated with an instance of the Hello class.

In the Your code, you ' re trying to create a instance of Thing from a static context. That's what the compiler are complaining about.

There is a few possible solutions. Which solution to use depends on what do you want to achieve.

• Change Thing to be a static nested class.

     1:staticclass Thing

• Create an instance of the Hello, then create an instance of Thing.

     1:publicstaticvoid main (string[] args)

     2: {

     3:     New Hello ();

     4:     Thing thing1 = h.new//Hope this syntax are right, typing on the fly:P

     5: }

• Move Thing out of the Hello class.

No enclosing instance of type Hello is accessible