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StudioExitt

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basic usage of java annotation and reflection

less than 1 minute read

Spring Annotation JAXB Annotation

Java Annotation

started java version 5
mapping of java attrivutes
good to use AOP (Aspect Oriented Programming)
can be used run-time and compile-time
- java reflection enables to use in runtime environment

Built-in Annotation

@Override
@Deprecated
@SuppressWarnings
@SafeVarargs
@FunctionalInterface

Meta Annotaions

@Retention
@Documented
@Target
@Inherited
@Repeatable

Annotion Usage : @Retention

RetentionPolicy
1. SOURCE : just comment, Not included in the source (ex: @Override, @SupressWarnings)
2. CLASS : included when compiling, ignored in VM
3. RUNTIME : included when compiling, used in VM (used by java reflection)
examples
- @Retention(RetentionPolicy.RUNTIME)

Annotation Ragne : @Target

ElementType
1. TYPE
2. FILED
3. METHOD
4. PARAMETER
5. CONSTRUCTOR
6. LOCAL_VARIABLE
7. ANNOTATION_TYPE
8. PACKAGE
examples
- @Target(ElemenyType.FIELD)
- @Target({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE})

@interface

Java Reflection

find the attributes of class objects

Spring Framework Annotation

Dependency Injection

@Required
@Autowired
@Inject

Controller

@Controller
@RestController
@RequestMapping
@PathVariable
@RequestBody
@RequestParam
@ResponseBody

Data Access

@Service
@Repository

Spring Boot Annotation

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