Are classes in Java `static` or `non-static`?

Are classes in Java static or non-static开发者_StackOverflow?

Static applies only to blocks, methods and class member variables. There's no meaning in having a Class Static, although an inner class can be static member of its enclosing class. Refer nested classes.

Classes are not static. only inner classes can be marked as static

public class NotStatic
{
   static class StaticClass
   {
   }
}

That is the only type that can be static.

Edit:

public class NotAStaticClass
{
   private static int foo;

   public static int getFoo()
   { return foo; }
}

How will you statically instantiate this class? Answer, you cannot. You must still utilize the new operator.

NotAStaticClass s1 = new NotAStaticClass();

Were you perhaps asking if Java is a statically typed language? If so, then the answer is yes. See Wikipedia on Static Typing

Are you taking about Static inner classes or Static Methods or Static Variables ?

As Best practice avoid using static in following cases

• Avoid using Static in MultiThreaded Env.
• Avoid having Static methods in your Business logic layer, if not you may lose the advantages of OOPs such as inheritance, runtime polymorphism.

Concept of something being static is to get initialized only once i.e have only one copy in memory.. The same copy can be used whenever we want without creating another copy in memory again. So Classes being templates are not static ...

Classes cannot be static. Only methods, blocks, and variables within a class can be static, but not the class itself.