public class Test{ public static void main(String[] args) throws Exception { Test test = new Test(); Child child = new Child(); // Your approach, which doesn't work try { test.getClass().getMethod("doSomething", new Class[] { child.getClass() }); } catch (NoSuchMethodException ex) { System.out.println("This doesn't work"); } // A working approach for (Method method : test.getClass().getMethods()) { if ("doSomething".equals(method.getName())) { if (method.getParameterTypes()[0].isAssignableFrom(child.getClass())) { method.invoke(test, child); } } } System.out.println("This works"); } public void doSomething(Parent parent) { }}class Parent {}class Child extends Parent {}
