어노테이션 추가

src/kr/co/swh/lecture/java/scene4/PlusAnnotation.java

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+package kr.co.swh.lecture.java.scene4;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * <pre>
+ * kr.co.swh.lecture.java.scene4 
+ * PlusAnnotation.java
+ *
+ * 설명 :	어노테이션 만들기
+ * </pre>
+ * 
+ * @since : 2019. 3. 13.
+ * @author : tobby48
+ * @version : v1.0
+ */
+@Target({ElementType.METHOD})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface PlusAnnotation {
+	String value() default "integer";
+	String plus() default "산술연산";
+}

src/kr/co/swh/lecture/java/scene4/PlusAnnotationMain.java

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+package kr.co.swh.lecture.java.scene4;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+/**
+ * <pre>
+ * kr.co.swh.lecture.java.scene4 
+ * PlusAnnotationMain.java
+ *
+ * 설명 :	어노테이션 메인
+ * </pre>
+ * 
+ * @since : 2019. 3. 13.
+ * @author : tobby48
+ * @version : v1.0
+ */
+public class PlusAnnotationMain {
+	public static void main(String[] args) {
+		//	PlusService 클래스에 있는 모든 메소드 얻기
+        Method[] methos = PlusService.class.getDeclaredMethods();
+        for (Method method : methos) {
+            //	메소드에 어노테이션이 적용되어 있다면
+            if(method.isAnnotationPresent(PlusAnnotation.class)) {
+                //	PlusAnnotation 객체를 얻은 후, 
+            	PlusAnnotation greetingAnnotation = method.getAnnotation(PlusAnnotation.class);
+                System.out.print(greetingAnnotation.plus());
+                try {
+                    //	PlusService의 메소드를 호출
+                    method.invoke(new PlusService());
+                } catch (IllegalAccessException e) {
+                    e.printStackTrace();
+                } catch (InvocationTargetException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+}

src/kr/co/swh/lecture/java/scene4/PlusService.java

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+package kr.co.swh.lecture.java.scene4; 
+
+/**
+ * <pre>
+ * kr.co.swh.lecture.java.scene4 
+ * PlusService.java
+ *
+ * 설명 :	어노테이션 적용 클래스
+ * </pre>
+ * 
+ * @since : 2019. 3. 13.
+ * @author : tobby48
+ * @version : v1.0
+ */
+public class PlusService {
+	@PlusAnnotation()
+    public void numericOperator() {
+        System.out.println("numericOperator()");
+    }
+
+    @PlusAnnotation(value = "string", plus = "문자열 결합")
+    public void stringOperator() {
+        System.out.println("stringOperator");
+    }
+}