Storing persistent data is always something that a lot of developers have to think about. We want to keep track of where we’ve been, what we’ve seen, etc. Persistent means that the data will be remembered even if we close the application, so when we return to it, the data is still there. There are…
Java IO Streams represent either an input source, or an output destination where you are trying to send receive/data. This can be to a console window, reading a file from a disk (or SSD), network communication, etc. Java uses the concept of IO streams, and how to handle them, almost identically between all sources. This…
As we’ve discussed, all elements on the screen in Flutter are a Widget. One interesting thing to note however, is there are two main categories of widgets, and that doesn’t mean stateless and stateful, rather those which only have a single child, and those which allow for children. Single Child Widgets These widgets will have…
Sending data to a server is extremely important, as without it, you cannot search/lookup data, add new data, make changes, or even potentially remove data. We’ll build off the idea of our last two examples of getting data from an Internet server with Flutter. And if we send data to a server, we’re almost always…
By default most of what we do in Flutter is single threaded. This works fine for simple tasks, but complex tasks, or tasks that have lots of steps might cause the application to become “jerky”. Parsing a large amount of JSON data is an example of something that might cause an app to slow down,…
Most apps will need to get some sort of data from the Internet. If you think about how much data there is, you would never want to update an app to store all of the data in your app. It would make your app both unnecessarily large and you would be updating it all the…
Polymorphism is the idea of an object being able to “look” or “act” like other types of objects. Now you might wonder why an object should “look” like another type of object, or even how it can look like another object. Polymorphism exists when you have is-a style relationships. So if you have a class…
A Java Interface, as first glance, may look similar to a class. However, there are important differences, not only in how it is used, but in defining it from a class that make it worth noting. Uses of an Interface Java prevents a developer from extending a Class with two or more classes. This is…
