# 92 - Creating SOLID Code: Liskov Substitution Principle

Great screencast Steve!!

Would it not be better to implement interfaces since the base classes don't have any code?

Stephen

@Stephen:

Great point!  Now that you mention it, the base classes are starting to look like 'legacy warts' on the design rather than playing a useful role here any more!

You get the pair-programmer-bonus-of-the-month-award for pointing that out.  Maybe now I need to do an L.1 installment to clean that up :D

Thanks for the comment -- it points out the the narrow application of any one design principle can sometimes blind one to the quality of the overall design (I'm sure there's a forest-for-the-trees principle waiting to be named for that pattern too!).

Thanks for the feedback and I'm glad you're finding value in the content.

-Steve B.

I sure find value in your screencasts. Keep up the good work!

With this dimecast, we are now SOL.  Here's looking forward to I and D!

@Dale,

What do you mean SOL?

He means that the three first letters in SOLID have been covered.

Thank you for the SOLID screencasts. Very informative.

Stephen what Visual Studio pluggin are you using. I'd like to give it a try.

You're seeing me use CodeRush + Refactor!Pro from http://devexpress.com.  I prefer these tools over the more-commonly-recommended Resharper but that's frankly naught but personal preference (I find the IDE integration of the visual cues from CR+R to be better than R# IMO).

Developer Express usually has fully-functional but time-limited trials of CR+R that you can download from their site if you're interested.

-Steve B.

PS: I make ZERO $$$ off any recommendations of tools so make your own choice for yourself and pick what yoiu find best suits you :)

Thanks Steve. I have used Resharper in the past. I will try this to compare.

Hello,

Please add your site at http://www.sweebs.com. Sweebs.com is a place where other people can find you among the best sites on the internet!
Its just started and we are collecting the best found on the net! We will be delighted to have you in the sweebs listings.

Regards
Kris

Great series! :)

The link to LSP was slightly tenuous don't you think?

Great episode! Thanks

replica Rolex Explorer

replica Rolex GMT

replica Rolex Masterpiece

replica Rolex Milgauss

Is this write up of a movie. I am interested in the manner of its writing its scenes.

This is good news for the business mand specially those selling real estate

The business community are happy to learn this new application software

He might not go this week, but he's further proof sea dweller that being sea dweller adorable can get you into the semifinals but rolex submariner not much rolex submariner further. Urban is the weakest male link, so he might as well blast submariner off with a submariner submariner blaze of glory with something rolex yachtmaster ridiculous like rolex yachtmaster And I Am Telling You I'm Not yachtmaster Going.

With yachtmaster rolex yacht master Jermaine Sellers rolex yacht master gone, dancer Hall remains as the loose cannon in the yacht master bunch. His yacht master confidence hasn't yet meshed with a breakout performance, and replica watches though his replica watches sedate take on Tina Turner's What's Love Got to Do With replica watch It was replica watch interesting, Hall has been the fake watches judges' punching fake watches bag to date.

Unless he kills it, say with a seductive Usher throw-down, Hall could be rolex the next to rolex go. Speaking of cute, James is still trying to shake off the whole rolex watch cougar-bait rolex watch thing, but his limp rendition of the too-frequent Idol cover I Don't Want to Be didn't rolex watches exactly show rolex watches off his rock chops. Regardless, assuming he doesn't completely tank, Casey replica rolex will likely make the top 12. He should, however, soar by proving replica rolex his grit this week with something edgier. How about an unplugged rolex replica Kid Rock tune? He's the rolex replica token rocker, which is a good place to be this year, because he's got virtually no competition.

Dewyze is on a hot streak, and he's got Simon tissot on his tissot side, so he should play it safe this armani watch week to ensure armani watch a top 12 berth. He's done well playing his acoustic armani watches guitar, so armani watches maybe a Kings of Leon song would work for him. What armani happened armani to you, man? Garcia seemed a shoo-in for audemars piguet watch the top audemars piguet watch three.

But he's gotten steadily diminishing returns thanks audemars piguet watches to sleepy audemars piguet watches song choices, like James Morrison's You Give Me Something, which audemars piguet find him audemars piguet fading into the pack. He needs another Straight Up, pronto! Now's lv watch the best lv watch time to wow the judges again with a clever arrangement lv watches of a classic lv watches — perhaps a folky version of Jane's Addiction's Been lv Caught lv Stealing?

He's not blowing anyone away, but movado watch slow-and-steady movado watch Lynche is getting it done every week. He's likeable, solid and very comfortable onstage. Big movado watches Mike is almost movado watches certainly going to advance, so a bit more of what the movado judges already movado like, perhaps a touch of Maxwell on parmigiani watch acoustic guitar, could parmigiani watch ensure his spot. Either Lambert is pulling a rope-a-dope and is planning to emerge parmigiani watches as a camera-ready parmigiani watches superstar from his mullet-duckling persona, or we're reading too much into his phoenix-like rise from the ashes of two twitchy weeks ago.

Hurley waking up in the field of flowers reminded me of replica alain silberstein watch the poppy replica alain silberstein watch sequence in The Wizard of Oz. Jack wanting to get moving replica alain silberstein watches toward whatever replica alain silberstein watches destiny awaited him while Hurley wanting to eat replica alain silberstein first—reminders replica alain silberstein that Hurley is gripped by hunger when he’s anxious and Jack armani replica defers food armani replica until his deeper yearnings are sated. They then fought replica armani watch over the replica armani watch right path back to The Temple.

Hurley was either going to take the long way replica armani watches or the replica armani watches wrong way, while Jack wanted to go directly back the replica armani way they replica armani came. It was hard to hear the line and not think Lost was audemars piguet replica saying audemars piguet replica something about its two-track, parallel world replica audemars piguet watch structure. Then replica audemars piguet watc Richard showed up and offered a third path. Jack followed. When replica audemars piguet watches Hurley asked replica audemars piguet watches if Richard could be trusted.

Jack said, At least he’s not stallin’. It was another wink at replica audemars piguet the audience replica audemars piguet in an episode full of them. Combined with the line about Napoleon’s Elba being baume mercier replica the place baume mercier replica where everything became clear, I wondered if Lost was addressing replica baume mercier watch anyone griping replica baume mercier watch about the pace of answers and saying, Don’t worry. Trust us. Okay? Ironically, replica baume mercier watches then replica baume mercier watches. He seemed to strongly replica baume mercier imply that replica baume mercier yes indeedy.

which was not where box watch he said was box watch taking them, although it was where we’ve been wanting Alpert to go for a couple box watches years now box watches as we’ve wondered if the ageless Others came to The Island via the box slave box ship. Another reading of Richard’s third way as a metaphor for bell ross watch Lost’s bell ross watch storytelling.

We won’t lead you astray, but we’re not going the way you bell ross expect.We’ll bell ross be doing this answer thing our way. Richard stormed into swiss rolex watch the bowels swiss rolex watch of the Black Rock and into its proverbial hurt locker—the place swiss rolex watches where military swiss rolex watches folk keep their explosives. The term hurt locker also swiss rolex refers to any swiss rolex place or situation where the soldier feels fundamentally unsafe. Both baume mercier watch terms applied to baume mercier watch Richard.

He was profoundly betrayed by Jacob’s baume mercier watches death, scared baume mercier watches out of his eyelashes by Smokey, and just a massive baume mercier existential mess baume mercier in general. He wanted out—and by out, I mean he wanted breguet watch Jack to blow breguet watch him up with dynamite because he breguet watches couldn’t do breguet watches the deed himself. He explained as breguet he stripped bregue some fuse.

He nailed John Legend's superocean heritage chronographe Everybody Knows superocean heritage chronographe last week, and a command replica watches performance replica watches of a Robin Thicke tune might cement his blue-eyed replica watch soul bona replica watch fides. All day long, I’ve been getting curious emails fake watches and tweets fake watches from readers of our weekly Lost recaps blasting me with breitling Black Rock breitling dynamite for not discussing a pretty monumental moment in last night’s episode.

I checked out the recap and made a discovery a lange sohne replica that made a lange sohne replica me want to blow my own bad replica a lange sohne watch self up: Somehow replica a lange sohne watch, my Black Rock analysis if you can call what I do analysis replica a lange sohne watches wasn’t there replica a lange sohne watches! I apologize and blame myself. I write and submit various drafts of the recap replica a lange sohne during the night, and replica a lange sohne amid the confusion I create, this section slipped alain silberstein replica through the alain silberstein replica cracks.

Jack and Richard’s discussion of breitling watch Jacob’s magical breitling watch touching and supernatural gifts in the dark belly of the breitling watches Black Rock breitling watches slave ship. Honestly, I ignored the first few replica breitling dozen of replica breitling these emails. Whaddya mean? I wrote 1500 words breitling replica about all breitling replica this! But after getting replica breitling watches another raft replica breitling watches of critical emails.

replica Louis Vuitton

replica Maurice Lacroix

replica Montblanc

replica movado

replica omega

replica oris

replica Panerai

replica Patek Philippe

When the beach crew saw her, the happy-huggy moment abruptly replica bvlgari ended, and replica bvlgari everyone gave her the stink-eye especially, ironically, Sawyer — just like cartier replica Jack and cartier replica Ben traded suspicious looks in last night’s episode. We learned at replica cartier watch the very replica cartier watch end of One Of Us that newbie Juliet was indeed shady; she had been sent by Ben replica cartier watches to spy on replica cartier watches the camp. The moment was mirrored, I think, by having Dr. Linus end with Widmore’s replica cartier submarine spying replica cartier on the castaways.

Why might Jack be so angry? Oh, I don’t know. The same reason Sally Brown was so angry after chanel replica spending all chanel replica night in a pumpkin patch with Linus Van Pelt waiting for transcendent replica chanel watch revelation to replica chanel watch arrive. This Island thing — Jacob, Ben, everything — has made a big mess of his life, and he replica chanel watches wants someone replica chanel watches to take responsibility for it. He wants payback. Sally’s cry is replica chanel his cry: replica chanel Of course, back in season 3, Juliet and Jack were chopard replica nurturing heroic chopard replica double-crosses.

Still, at this point in the season, I’m looking inside Jack’s heart, and replica chopard watch wondering replica chopard watch which way his scales are tilting. Will he be replacing Jacob by replica chopard watches season’s end replica chopard watches or Smokey? A study published earlier this week by the American Medical replica chopard Association's replica chopard Archives of Internal Medicine argues that if pizza and soda concord replica were more concord replica expensive, people would consume them less frequently replica concord watch in favor of healthier fare.

Sallie James, a policy analyst at the libertarian Cato Institute, denounces panerai watch these types panerai watch of proposals as paternalistic. It's no one's business what anybody puts in their mouths, she panerai watches says in an panerai watches interview. I suspect some lawmakers are attracted to it for a revenue source. With government budgets panerai being squeezed panerai, she has a point. Of course, obesity is a serious problem. Medical expenses for men's watches the overweight men's watches accounted for 9.1% of total U.S. medical expenditures in 1998 and may have women's watches reached as women's watches high as $78.5 billion.

according to the CDC. Approximately half of these costs were paid ladies watches by Medicaid ladies watches and Medicare. From big chains to mom-and-pop operations, pizza is about a $50 breitling watch billion business breitling watch in the U.S. Many pizza restaurants have suffered in recent years from wildly fluctuating breitling watches commodities breitling watches prices; meanwhile, cash-strapped have customers increasingly chosen to dine out in breitling cheaper fast-food breitling restaurants. An 18% tax increase on pizza and soda would cartier watch be devastating cartier watch to the industry.

Which counts on soda sales to boost its profits, says cartier watches Jennifer Litz cartier watches editor of Pizza Marketplace, an industry Web site. Some cartier pizza chains cartier seem puzzled as to why their product specifically is under fire chanel watch from anti-obesity chanel watch activists. Pizza is completely customizable -- you can make it as healthy chanel watches or as indulgent chanel watches as you want, says Tim McIntyre, vice president for communications chanel at Domino's chanel Pizza Inc.in an email statement.

Anti-obesity soda taxes are being discussed in New York and Philadelphia. There replica concord watches is even replica concord watches talk of a levy at the federal level. Both the Centers for Disease Control and replica concord Prevention replica concord and the American Heart Association support soda taxes. But corum replica these taxes corum replica are unfair to the poor, who already spend a far greater fraction of their salaries replica corum watch on food replica corum watch than the wealthy. And attempts to change behavior through taxation or replica corum watches legislation don't always replica corum watches produce the desired effects.

For years, smoking rates declined as cigarette taxes skyrocketed. Then the replica corum declines replica corum stalled, in part because states did not spend enough on smoking cessation ferrari replica efforts The ferrari replica CDC estimates that about 46 million American adults are smokers. Studies replica ferrari watch of New York replica ferrari watch City's law mandating that restaurants provide calorie information disagree about replica ferrari watches whether it is replica ferrari watches having a positive impact. Americans are quite ingenious at replica ferrari avoiding laws replica ferrari they don't like.

Think about the throngs of people who take special road trips franck muller replica to buy Fourth franck muller replica of July fireworks which are illegal where they live. Delaware advertises itself at the home of tax-free replica franck muller watch shopping because replica franck muller watch it lacks a sales tax: In theory, out-of-state residents are supposed to declare replica franck muller watches their Delaware replica franck muller watches purchases to their home states, but most never bother. At least these items are replica franck muller easily identifiable: Can replica franck muller you imagine the fights that will occur over obesity-prevention taxes if experts can't agree on graham replica what is graham replica nutritious.

Rip Blu-ray DVDs, common DVDs into video formats and convert almost all of videos from one to another, Blu Ray Ripper || Blu Ray Ripper for Mac //*  Blu ray Converter //* Blu ray  Copy *//  Blu ray Cloner //* Blu ray Maker \\\ Blu ray Burner //*  Blu ray Backup

  We see more kitchen hoods here.
 kitchen range hoods >**< kitchen range hood  > range hood  range hoods  kitchen hoods kitchen hood ****     hood vent >

I read your article.The things you have written sound very sincere and nice topics i am looking forward to its continuation. Blu ray ripper