java8 Function可用于getter上，方便

public class MyTest {
    
    @Test
    public void testFunction() throws Exception {
        String userAttr = getUserAttr(User::getName);
        System.out.println(userAttr);
    }

    private String getUserAttr(Function<User,String> getter){
        User user = new User();
        user.setId("afsdafsd");
        user.setName("test");
        return getter.apply(user);
    }
}

@Data
class User {
    String id;
    String name;
}