This paper proposes programming design using a glue code. 
If a program is designed with a glue code, we can change the 
connection among components in the program without any changes of their implementations. 
A glue code is a new kind of aspects which is specialized for connecting components.  
This paper also proposes GluonJ, which is a new aspect-oriented system for glue codes. 
It provides integrated language constructs for dependency injection and aspect-oriented programming. 
GluonJ is more suitable for describing glue codes than existing systems.