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Bruce and Foster proposed the language LOOJ, an extension of Java with the notion of MyType, which represents the type of a self reference and changes its meaning along with inheritance. MyType is useful to write extensible yet type-safe classes for objects with recursive interfaces, that is, ones with methods that take or return objects of the same type as the receiver. Although LOOJ has also generics, MyType has been introduced as a feature rather orthogonal to generics. As a result, LOOJ cannot express an interface that refers to the same generic class recursively but with different type arguments.
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