Java优学网DI依赖注入入门解析：告别硬编码，拥抱Spring自动注入的便捷与高效
publicclassOrderService{privatePaymentServicepayment=newAlipayService();}@ComponentpublicclassOrderService{privatefinalPaymentServ...
publicclassOrderService{privatePaymentServicepayment=newAlipayService();}@ComponentpublicclassOrderService{privatefinalPaymentServ...