Generics

Generic classes and methods, bounded types, wildcards and type erasure.

3 notes

Notes

Generics let a class or method work with a type supplied by the caller, moving whole families of errors from runtime to compile time.

Java

Bounds restrict what a type parameter may be, and wildcards let a method accept a family of parameterised types safely.

Java

Generic type information exists only at compile time. Knowing what the compiler removes explains every generics restriction.