← Exit to Module 12: Generics and Type Safety lessons
Module progress · 0%Lesson · 12 min
Module 12: Generics and Type Safety
Lesson focusWhy Generics?
See how generics eliminate casts and runtime ClassCastException problems.
01 · 12 minWhy Generics?Locked02 · 16 minGeneric Classes & InterfacesLocked03 · 15 minGeneric MethodsLocked04 · 18 minBounded Type ParametersLocked05 · 16 minWildcards & VarianceLocked06 · 14 minType Erasure & LimitationsLocked07 · 30 minMini-Project: Generic Data StructureLocked
Before generics, collections stored Object; consumers had to cast, risking runtime errors.
Generics provide compile-time safety and self-documenting code.
Type inference reduces verbosity when instantiating generic classes (new HashMap<>();).