ABAP Keyword Documentation → ABAP - Reference → Declarations → Declaration Statements → Classes and Interfaces → CLASS
CLASS - IMPLEMENTATION
Other versions: 7.31 | 7.40 | 7.54
CLASS class IMPLEMENTATION.
In the statement block
CLASS class IMPLEMENTATION - ENDCLASS, the following methods of a class
class must be implemented, in any order:
All concrete methods that
are declared using
CLASS-METHODSin the declaration part of the class.
All concrete methods of interfaces that are listed by the statement
INTERFACESin the declaration part of the class.
All methods inherited from superclasses that are listed by the statement
METHODS ... REDEFINITIONin the declaration part of the class.
The implementation of each method corresponds to a processing block
METHOD - ENDMETHOD. No statements are allowed in the implementation part outside of method
implementations. All components of the class can be accessed in an instance method implementation. All
static components of the class can be accessed in a static method implementation. You do not need a
component selector to address the component of your own class. Within the implementation of each instance
method, there is an implicitly created, local reference variable named
me available at runtime. It points to the current instance of the method.
When implementing methods declared in an interface bound by the class
intf, the name of the method in
must have either
intf~ in front of it or use an alias name declared using
ALIASES. The interface method
must be declared in the interface. Otherwise, a syntax error will occur when local interfaces are used.
If you specify a global interface using
intf~, only a syntax warning is issued.
In this way, the classes remain usable even after subsequent removal of the methods from the global interface, provided they have not used the methods themselves.
- A class that does not need to implement any methods on the basis of its declaration part either has an empty implementation part or none at all.
- Abstract methods in abstract classes cannot be implemented in the implementation part.
The implementation part of a class can only be specified in the context described under
In this example, three methods of the class
c2 must be implemented. The method
c1 is abstract and must not be implemented there.
INTERFACE i1. METHODS m1. ENDINTERFACE. CLASS c1 DEFINITION ABSTRACT. PROTECTED SECTION. METHODS m1 ABSTRACT. ENDCLASS. CLASS c2 DEFINITION INHERITING FROM c1. PUBLIC SECTION. INTERFACES i1. METHODS m2. PROTECTED SECTION. METHODS m1 REDEFINITION. ENDCLASS. CLASS c2 IMPLEMENTATION. METHOD m1. ... ENDMETHOD. METHOD m2. ... ENDMETHOD. METHOD i1~m1. ... ENDMETHOD. ENDCLASS.