proving that, given an object, we can know if some of the methods it understands are from a trait

traitsInJava

public interface InterfaceA {
	
	public default String m1() {
		return " This is InterfaceA.m1";
	}
}

public class SomeClass implements InterfaceA {

	public static void main(String[] args) {
		
		List<Method> declaredMethods = Arrays.asList(new SomeClass().getClass().getMethods());
		
		declaredMethods.forEach(m -> System.out.println(m.getName() + (m.isDefault() ? " is default" : " is not default")));
	}
}