دورة حياة الـ Bean والاستدعاءات

في هذا الدرس

name the four lifecycle stages.

الموضوعات المخطط لها

• Stages: instantiation (constructor), injection of dependencies, initialization, destruction at shutdown.
• @PostConstruct runs after injection; @PreDestroy runs before the bean is removed.
• Use callbacks for light setup and cleanup, not heavy work.
• Never use injected fields inside the constructor body of a field-injected bean: they are not set yet.