W2class Tutorials for Android, Java, Php, Html

Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object. Any Java object that can pass more than one IS-A test is considered to be …

Inheritance can be defined as the process where one class acquires the properties (methods and fields) of another. In other words, the derived class inherits the states and behaviors from the base class. The derived class is also called subclass and the base class is also known as super-class. The …

In this page, we will learn about basics of OOPs. Object Oriented Programming is a paradigm that provides many concepts such as inheritance, data binding, polymorphism etc. An object in OOP has some state and behavior. In Java, the state is the set of values of an object’s variables at any …

Google Analytics is an outstanding website analytics tool that gives you way more information about your website than you probably need. Better to get more than you want than not enough, right? Anyways I check my website statistics more often than I should and it ends up taking a few …

Variables are nothing but reserved memory locations to store values. This means that when you create a variable you reserve some space in memory. Based on the data type of a variable, the operating system allocates memory and decides what can be stored in the reserved memory. Therefore, by assigning …

When our application does a task that takes a considerable amount of time, it is common sense to show the progress of the task to the user. This is a good User Experience practice. In this tutorial i will be discussing the implementation of a process-progress dialog. As an example, …

Java is an Object-Oriented Language. As a language that has the Object Oriented feature, Java supports the following fundamental concepts: Polymorphism Inheritance Encapsulation Abstraction Classes Objects Instance Method Message Parsing In this chapter, we will look into the concepts Classes and Objects. Object – Objects have states and behaviors. Example: …

Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This tutorial gives a complete understanding of Java.

The android.graphics.Canvas can be used to draw graphics in android. It provides methods to draw oval, rectangle, picture, text, line etc. The android.graphics.Paint class is used with canvas to draw objects. It holds the information of color and style. In this example, we are going to display 2D graphics in …

The screenOrientation is the attribute of activity element. The orientation of android activity can be portrait, landscape, sensor, unspecified etc. You need to define it in the AndroidManifest.xml file. For example: <activity android:name="com.example.screenorientation.MainActivity" android:label="@string/app_name" android:screenOrientation="landscape" > The common values for screenOrientation attribute are as follows: Value Description unspecified It is …