Ans: Dependency means something that is dependent on something .When an object dependent on another object then that object is the dependent object. Ex: if we assume car is an object then tire ,door, machine is the dependent object of car. So, dependency injection means of injecting dependent object from object factory(Spring container) throw constructor/setter/autowiring .
Dependency can be injected throw -
1.Constructor injection
2.Setter injection
3.Autowiring.
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