获取类的所有(派生)接口

import java.lang.reflect.Method;

public class GetAllInterfaces {
    public static void main(String[] args) {
        Class<?> clazz = MyClass.class;
        Class<?>[] interfaces = clazz.getInterfaces();
        for (Class<?> iface : interfaces) {
            System.out.println("Interface: " + iface.getName());
            Method[] methods = iface.getDeclaredMethods();
            for (Method method : methods) {
                System.out.println("  Method: " + method.getName());
            }
        }
    }
}

interface MyInterface {
    void myMethod();
}

class MyClass implements MyInterface {
    public void myMethod() {
        System.out.println("My method!");
    }
}