[Java] How to get Inherited or same class in ClassLoader (클래스로더에 로드된 클래스 중 특정 클래스나 그 클래스를 상속받는 클래스 찾기)

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public class DorbaeClassLoaderUtil { public static java.util.List< Class< ?>> findInheritedClasses( ClassLoader classLoader, Class< ?> parentClass) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException { java.util.List< Class< ?>> filteredClasses = new java.util.LinkedList< Class< ?>>(); Field f = ClassLoader.class.getDeclaredField( "classes"); f.setAccessible( true); Vector< Class< ?>> classes = ( Vector< Class< ?>>)f.get( classLoader); int size = classes.size(); Class< ?> cls = null; for ( int ll = 0; ll < size; ll++) { try { cls = classes.get( ll); if ( parentClass.isAssignableFrom( cls)) { filteredClasses.add( cls); } } catch ( Exception e) { continue; } catch ( Error e) { continue; } } return filteredClasses; } public static void main( String[] args) throws Exception { A a = new A(); B b = new B(); C c = new C(); System.out.println( "=================== All Classes ==================="); java.util.Vector< Class< ?>> clss = DorbaeClassLoaderUtil.getAllLoadedClasses( Thread.currentThread().getContextClassLoader()); for ( int ll = 0; ll < clss.size(); ll++) { System.out.println( clss.get( ll).getName()); } System.out.println( "=================== Inherited Classes ==================="); java.util.List< Class< ?>> clsss = DorbaeClassLoaderUtil.findInheritedClasses( Thread.currentThread().getContextClassLoader(), C.class); for ( int ll = 0; ll < clsss.size(); ll++) { System.out.println( clsss.get( ll).getName()); } } } class A extends C { public A() {} } class B { public B() {} } class C { public C() {} }