W2class Tutorials for Android, Java, Php, Html

Checked and Unchecked Exception is two types of Exception exist in Java. Though there is no difference in functionality and you can very achieve same thing with either checked Exception or Unchecked Exception, there is some difference on exception handling part. 1)Checked Exception Exception which are checked at Compile time …

There are many differences between throw and throws keywords. A list of differences between throw and throws are given below: 1) You can declare multiple exception thrown by method in throws keyword by separating them in common e.g. throws IOException, ArrayIndexBoundException etc, while you can only throw one instance of …

Parsing XML essentially means navigating through an XML document and returning the relevant data. An increasing number of web services return data in JSON format, but a large number still return XML, so you need to master parsing XML if you really want to consume the full breadth of APIs …

Google’s upcoming operating system named Android L looks very promising. It is highly focused on rich user experience and what they called it as material design. In this example we will take a look at the new UI widget called RecyclerView. RecyclerView is more advanced and flexible and efficient version …

The ArrayList class extends AbstractList and implements the List interface. ArrayList supports dynamic arrays that can grow as needed. Standard Java arrays are of a fixed length. After arrays are created, they cannot grow or shrink, which means that you must know in advance how many elements an array will …

Collections in java is a framework that provides an architecture to store and manipulate the group of objects.This framework has several useful classes which have tons of useful functions which makes a programmer task super easy. All the operations that you perform on a data such as searching, sorting, insertion, …

An exception (or exceptional event) is a problem that arises during the execution of a program. When an Exception occurs the normal flow of the program is disrupted and the program/Application terminates abnormally, which is not recommended, therefore these exceptions are to be handled. Exception can occur at runtime (known …

An interface is a reference type in Java, it is similar to class, it is a collection of abstract methods. An interface in java is a blueprint of a class. It has static constants and abstract methods only. The interface in java is a mechanism to achieve fully abstraction. There …

If subclass (child class) has the same method as declared in the parent class, it is known as method overriding in java. In other words, If subclass provides the specific implementation of the method that has been provided by one of its parent class, it is known as method overriding. …

In Java, it is possible to define two or more methods of same name in a class, provided that there argument list or parameters are different. This concept is known as Method Overloading. If a class have multiple methods by same name but different parameters, it is known as Method …