import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Comparator;

public class Main {
    class MyType {
    }

    class MyComparator implements Comparator<MyType> {
        @Override
        public int compare(MyType o1, MyType o2) {
            return 0;
        }

        @Override
        public boolean equals(Object obj) {
            return false;
        }
    }

    public static void main(String[] args) {
        Class<?> klass = MyComparator.class;
        Type comparatorType = klass.getGenericInterfaces()[0];
        System.out.println(comparatorType.getTypeName());
        ParameterizedType preciseType = (ParameterizedType) comparatorType;
        System.out.println(preciseType.getActualTypeArguments()[0]);
    }
}