Object Reuse and Behavior Adaptation in Java-like Languages

We propose new linguistic constructs for composing objects in a Java-like language. Objects are intended as featherweight components which can be used in multiple compositions, and object types specify not only the implemented functionalities, but also the required methods, which will be provided by other components during composition. Thus the language supports flexible object reuse and adaptation of the object behavior at run time. The static type discipline guarantees that method calls on well-typed object compositions are safe.