Making use of the Properties class


In this section, let us make use of the Properties class for storing and loading application related configuration values as well as other user information. It is also possible to query or modify the various System properties using this class. For example, the following code tries to get all the properties that are available for […]

Parsing Input using Scanner


A Scanner object can be used to read text input from a number of sources. The input source can be a file, an input stream or even from a string. It internally uses the Regular Expression Api for parsing and getting the input. Let us see a simple example to parse a String object, also […]

Parsing XML Documents using SAX


Xml Parsers are used to parse and extract information from Xml Documents. The most commonly used Xml Parsers are Simple API for Xml Parsing and Document Object Model. SAX Parsers are preferred when the size of the Xml Document is comparatively large and the application doesn’t wish to store and reuse the Xml information in […]

Persisting Object State in Xml Format


Persistence is the process of saving the state of an object permanently to a storage like file or database, and the state of the object can be restored at a later time. In Java terms, Persistence is nothing but Serialization. For example, the following code is used to save the state of an object in […]

Randomly accessing the file contents


In this techincal tip, let us see how to access the contents of a file randomly instead of the traditional sequential access. Imagine that we want to search for a particular record in a file. If we prefer Sequential access in this case, then it will involve traversing over the file byte by byte and […]

Sorting Custom Types in Java


The class java.util.Collections provides many Utility methods for simplifying the most commonly used operations. One of the methods available in that class is sort() which is used for sorting elements. Let us the see how the Collections.sort() method operates on pre-defined data-types as well as user-defined data-types. also read: Java Tutorials Java EE Tutorials Design […]

jUDDI and Configuration in jBoss and MySQL database


UDDI is one of the core Web Service standard. It provides access to Web Service Description anguage which provides binding information and message formats required to interact with the web services listed in its directory. Enterprises that seek to optimize software or service reuse subscribe to some form of service-oriented architecture (SOA), server programs or […]

Recursively traversing files and folders using Java File API


In this section, let us see how to recursively traverse over files and folders by making use of Java File API. Whether it is a folder or a file, both are represented as a object. For example, consider the following code snippet, also read: Java Tutorials Java EE Tutorials Design Patterns Tutorials Java File […]

Factory pattern – Design Patterns in Java/J2EE


Creational pattern deals with the creation of objects and it hides the complex logic involved in the object creation object from the clients. One of the common creational patterns is the Factory pattern and it is used extensively in Applications. Let us understand what factors should be considered in mind while designing a Factory pattern […]

Conversion between Array and List types


In some cases, we may need to convert an array to a list or vice versa. The method asList() is available in the Arrays class, and the toArray() method in list and set classes serve this purpose. also read: Java Tutorials Java EE Tutorials Design Patterns Tutorials Java File IO Tutorials The Arrays.asList() method converts […]