As the purpose of this article is to make you, a Java developer aware of useful JSON library, I leave the decision of choosing the JSON library for yourself. Depending upon your need, you can choose any of them. Jackson is a multi-purpose Java library for processing JSON data format. Jackson aims to be the best possible combination of fast, correct, lightweight, and ergonomic for developers. If you are only interested in converting Java objects to and from JSON string then the third method is most appropriate for you. The pros of Jackson are that It provides heaps of features and looks to be a good tool for reading and writing JSON in a variety of ways, but at the same time, its size becomes a disadvantage if your requirement is just to serialize and deserialize Java object to JSON String. In order to use Jackson, you can include the following maven dependency or manually include jackson-core-2.3.1.jar, jackson-databind-2.3.1.jar, and jackson-annotations-2.3.1.jar in Classpath. If you are serious about learning REST API then you can also check out Master Java Web Services and REST API with Spring Boot course on Udemy. It's a great course to start with Java web services, particularly REST API with Spring Boot.

With no warning, your washing machine has become violently mutinous. As you watch in horror, its typical spin cycle goes psycho. The entire possessed unit vibrates across the floor toward you, with the lid flung open and untold gallons of water spewing, soaking your basement and sinking your savings account. It's probably time to buy another one. Whether your older appliances have gone berserk or just really need updating, the used-appliance market is always an option. But it's best to understand the pros and cons of used equipment before you spring for the first refrigerator you find on a classified ad Web site. What's more, there's a certain element of risk that comes into play every time you buy a used product, whether it's a car, camera or dryer. We'd love to vouch for specific product categories and their general reliability on the used market. However, product quality varies so much from manufacturer to manufacturer (and even within products made by one company), that it's difficult, if not impossible, to say that ovens, for example, are always a great deal when you find them used.

That's why you have to shop smart, be observant and always, always do your homework before you buy. We have vital pointers to share for when you go shopping for these necessary appliances. Keep reading, and you'll see how to replace your demonic washer with one that doesn't leave you all wet. Major appliances such as refrigerators, gas ranges and freezers generally need little in the way of maintenance and repairs. Another key point: They are often the most expensive to purchase in squeaky-clean, brand-new condition. Those large appliances are the most costly, but they also have the longest lives. A full-size refrigerator can last around two decades with almost no maintenance. Perhaps they remodeled their kitchen and the old fridge looks horribly out of place. Or maybe an elderly gentleman with a bad back just can't stoop to use a side-loading washing machine anymore. These cast-off products are in great working condition, and you can nab them for a fraction of the new purchase price.

Even if your bargain buy conks out after just a few years of use, there's a very good chance you'll still have saved money in the long run. A couple of exceptions might be built-in refrigerators and gas cooktops. Similarly, if you're trying to decide between repairing a broken appliance or buying another one, the Consumer Reports advice is simple -- if the cost of the repair is more than half of the price of a new (or great, used) product, don't even consider the repair. Your local appliance store can be a bonanza for bargain shopping if you know where to look and which questions to ask. You just have to do a bit of investigating. Although they don't technically count as used, the scratch-and-dent sections of appliance, hardware and home furnishing stores often have unbelievable deals. You might find a top-end refrigerator with an unfortunate but superficial dent on the side, and at a price hundreds of dollars lower than models in mint condition.

For those kinds of savings, you can find plenty of ways to disguise that flaw. And if your store doesn't seem to have any, you can always inquire about floor models. Many outlets will part with these demonstration models (which have been pawed at and caressed by hundreds of potential buyers) at a steeply discounted price. With floor and scratch-and-dent deals, you may not get a full warranty, but you might well receive what's left of the active warranty, which you probably won't find from a private seller. A warranty (albeit a shorter and more limited one) is even more likely if you choose a refurbished or remanufactured model sold at a retail outlet. You'll save a lot of money and have the added benefit of peace of mind. And here's another pointer: When it comes to damaged or discolored appliances, there are two miraculous words that can change everything: spray paint. Many appliances have surfaces that look wonderful with a fresh layer of aerosol paint.

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