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Java OOP Details

Static Member

General Info: Static Class / Static Member

A static member is a member you can have access to without instantiating the class into an object. For example, you can read and write static properties and call static methods without ever creating the class. Static members are also called class members (class methods, class properties, etc.) since they belong to the class and not to a specific object. A static class is a class that contains only static members. In the UML, these classes are described as utility classes.

Languages Focus

Languages that support static members usually at least support static member fields (the data). Some languages also support static methods, properties, etc. in which case the class member is held in memory at one location and shared with all objects. Finally, some languages support static classes which usually means the compiler will make sure a static class contains only static members.

Java:  "Static Members" static

When calling a static method from within the same class, you don't need to specify the class name.

Syntax Example:
class MyUtils {
//Static method.
  public static void MyStaticMethod() {
}
}




Cross Reference Examples:

Access VBA:  "Static Members" Not Supported
ASP Classic:  "Static Members" Not Supported

Although ASP Classic supports the creation of simple classes, it does not support static methods.

C#:  "Static Members" static

C# supports both static members and static classes using the static keyword. You can add a static method, field, property, or event to an existing class. Also, you can designate a class as static and the compiler will ensure all members in that class are static. You can add a constructor to a static class to initialize values.

The CLR automatically loads static classes with the program or namespace.

Syntax Example:
//Static Class Example
public static class MyStaticClass
{
  //Static Method Example
  public static void MyStaticMethod()
{
// static method code
}
}
C++:  "Static Members" static

C++ supports static methods and static member fields.

Syntax Example:
class MyUtils {
public:
static void MyStaticMethod();
};
Corel Paradox:  "Static Members" Not Supported
Delphi:  "Class Members" Class

Object Pascal supports static methods, but not static member fields. For static member fields, use traditional Pascal-like global variables.

Since Object Pascal is a hybrid language, you can use global functions and data so the need for class methods is diminished but still useful. For example, since Object Pascal does not have automatic reference counting, you could use a class method to keep track of the number of object instances.

Delphi 1-7: All classes in a unit are friendly (see eachother's private members), some developers like to put each class in it's own unit and reserve putting multiple classes in the same unit until they wish to implement friendly classes.

Delphi 2005+: New strict keyword allows you to indicate friendly.

Delphi Prism: The Strict keyword was introduced from the beginning (Delphi.Net preview that shipped with D7).

Syntax Example:
type
TMyUtils = class(TObject)
public
class function MyStaticMethod: Integer;
end;

In implimentation:

class function TMyUtils.MyStaticMethod: Integer;
Delphi Prism:  "Class Members" static

In Prism, you static members are also referred to as class members. You implement class members using the static keyword.

VB Classic:  "Static Members" Not Supported
VB.Net:  "Shared Members" Shared

VB.Net supports both static members and static classes (use the keyword Shared). You can add a static method, field, property, or event to an existing class.

You can designate a class as static and the compiler will ensure all methods in that class are static. You can add a constructor to a static class to initialize values.

The CLR automatically loads static classes with the program or namespace.

Syntax Example:
Public Shared Function MySharedFunction() As Integer
  MySharedFunction = 12345
End Function




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