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Showing posts from September, 2017

interface and interface collections in java

Interfaces: Interface in Java refers to the abstract data types. They allow Java collections to be manipulated independently from the details of their representation. Also, they form a hierarchy in object-oriented programming languages. As you have already learnt about Abstract methods and abstract classes and how they are implemented. The main difference between an abstract class and an interface is that in an abstract class there exists at least one abstract method. On the other hand, an interface consists of all the methods as abstract. Here, by abstract we mean that the methods are unimplemented.We all know that multiple inheritance is not supported in java. This is because of the conflicts that might arise when both the parent classes are having the same variable declarations. This makes it hard for the child class to infer which class the particular variable or the method belongs.Even though it is said that Java directly doesn’t support multiple inheritance, it might support the…

Logging levels and Resources in Android

Logging and Resources in Android
In these series of posts, we are going to learn about the Android permission system, Network IO and how to move time consuming tasks off the main UI thread. In this post we will learn about the logging levels in android and the use of Resources directory in Android.
Whenever you run an application, you might have seen a window pop up showing different messages like “A slow app needing to skip frames” or “An Error occurred” or perhaps “Some request or process finished”. These messages are called Log Messages. Developers use log messages to communicate information about their application. When you use logs in your app, you must declare the log level that your app must use.

There are 5 log levels in Android:
·ERROR: Use error to log any error messages·WARN: Use warn to log messages that wont crash your app but remain a concern.·INFO: Info is mainly used to log informative messages like “CONNECED TO THE INTERNET”.·During development, we can use both d…

What’s the difference between AngularJS, Angular2 and Angular4?

One question that often comes out is “What is the basic difference between AngularJS, Angular 2 and Angular 4 and how to jump from Angular 2 to Angular 4?”

Angular JS was introduced in 2010 as a JavaScript framework for building client side single page web applications. So it gained popularity and the Angular team at google started to add some more features to the core. But the framework was not designed with the needs of today’s applications in mind and moreover it was totally complex. So the Angular team decided to rewrite the entire framework using TYPESCRIPT and as a result Angular 2 was released in mid 2016. The new Angular framework is completely different from the previous version and we can think of it as a completely different framework compared to the earlier one.

The decision was frustrating to most of the developers since a lot of applications have been designed using AngularJS. I personally liked the direction that Angular developers took in rewriting the entire framework a…