Dynamic Invocation In JAVA (동적 메쏘드 호출)

자바에 이런 기능이 있다니 참으로 놀랍다.

특정 클래스에는 어떤메쏘드가 있으며 

그에 따른 파라미터 타입이라던지 특정 메소드 호출까지 제어할 수있다.

/// /// @brief This code will show how to use dynamic invocation in java. /// @author Dohyun Yun /// import java.lang.reflect.Method; public class test { public static void main(String[] args) throws Exception { Class testClassInfo = TestClass.class; Method[] methods = testClassInfo.getDeclaredMethods(); TestClass obj = new TestClass(); for (Method method : methods) { String methodName = method.getName(); System.out.println( "------------------------------------------" ); System.out.println( "Method Name : " + methodName ); System.out.println( "Method Name with param : " + method.toString() ); System.out.println( "Method Param No : " + method.getParameterTypes().length ); if ( methodName.equals("testMethodOne") ) method.invoke(obj); if ( methodName.equals("testMethodTwo") ) method.invoke(obj, 10); if ( methodName.equals("testMethodThree") ) method.invoke(obj, 10, "Test String"); } } // end - main() } // end - test class TestClass { public void testMethodOne() { System.out.println("testMethodOne is called"); } public void testMethodTwo(int i) { System.out.println("testMethodTwo is called : " + Integer.toString(i) ); } public void testMethodThree(int i, String t) { System.out.println("testMethodThree is called" + Integer.toString(i) + " " + t); } private void testMethodFour(int i, String t, String t2) { System.out.println("testMethodFour is called" + Integer.toString(i) + " " + t + t2); } } // end - TestClass

결과

------------------------------------------ Method Name : testMethodOne Method Name with param : public void TestClass.testMethodOne() Method Param No : 0 testMethodOne is called ------------------------------------------ Method Name : testMethodTwo Method Name with param : public void TestClass.testMethodTwo(int) Method Param No : 1 testMethodTwo is called : 10 ------------------------------------------ Method Name : testMethodThree Method Name with param : public void TestClass.testMethodThree(int,java.lang.String) Method Param No : 2 testMethodThree is called10 Test String ------------------------------------------ Method Name : testMethodFour Method Name with param : private void TestClass.testMethodFour(int,java.lang.String,java.lang.String) Method Param No : 3