01.DI and IoC

• IoC (Inversion of Control):
  • Instead of creating and wiring objects, Spring’s container creates them and manages how they connect.
• DI (Dependency Injection):
  • Spring gives (injects) the objects your class depends on, rather than your class doing new internally.
• Relationship:
  • IoC is the idea/principle;
  • DI is the most common way Spring implements IoC.