Overriding the toString() method in Object class

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The toString() method in the Object class is used to display some information regarding any object. If any code needs some information of an object of a class, then it can get it by using this method. The toString() method of an object gets invoked automatically, when an object reference is passed in the System.out.println() […]

Externalizable Interface in Java

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Serialization is the process of giving persistence storage to Java objects so that they can be restored at a later time. Classes can be made persistent in Java by implementing the Serializable interface. Serializable is a marker interface meaning that it has no methods within it. Any Serializable class can be passed on to ObjectOutputStream.writeObject(object) […]

Enhanced for-loop for User-defined objects

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Enhanced For-loop is a new syntax for traversing over a collection of objects and it was introduced from Java 5.0. Let us see how Enhanced for-loop operates on user-defined Objects. The following example shows the syntax of using enhanced for-loop on a Collection object, also read: New Features in Java 5.0 Generics in Java 5.0 […]

Singleton Pattern – Design Patterns in Java/J2EE

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Situations often will demand for the existence of only one object for a particular class in an Application. For example, the existence of only one Database Connection for a particular session, one object referencing the set of Global properties being shared across the various modules, etc. Such classes are candidates to be designated as Singleton […]

Template method Pattern – Design Patterns in Java/J2EE

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A Template method pattern provides a skeleton for performing any sort of algorithm or an operation, and it allows the sub-classes to re-define part of the logic. Let us directly get into an example to clarify things in a much better manner. For example, if we wish to write a String Decorator class, which decorates […]

Strategy Design Pattern In Java

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Strategy design pattern falls under the category of Behavioural patterns. Assume that we have an object and its behavior is largely dependent on the state of its internal variables. Strategy pattern allows, object to behave in different ways depends on the internal state. Strategy pattern is defined in the book Gang of fourĀ is, Allows an […]

Using the new Process Builder class

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We all know how to execute programs from within a Java Application by making use of the Runtime Api. For example, assume that we want to launch the Internet Explorer browser within the Java code. Then the following code snippet will just do that, also read: Java Tutorials Java EE Tutorials Design Patterns Tutorials Java […]

HashCode and equals methods

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HashTable, HashMap and HashSet are the Collection classes in java.util package that make use of hashing algorithm to store objects. In all these Collection classes except HashSet, objects are stored as key-value pairs. For the storage and the retrieval of any user-defined objects it is a good practice to override the following methods which is […]

Expression Language in JSP 2.0

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1)Introduction Expression Language was first introduced in JSTL 1.0 (JSP Standard Tag Library ). Before the introduction of JSTL, scriptlets were used to manipulate application data.JSTL introduced the concept of an expression language (EL) which simplified the page development by providing standerd tag libraries. These tag libraries provide support for common, structural tasks, such as: […]

What is UDDI?

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Introduction Welcome to the future of Internet-based application development and deployment. This article will give us an idea about Universal, Description, Discovery and Integration (UDDI). What is it ? Why it is an important in the future of Web services standards ? This article explains that UDDI is focused on sharing business information, making it […]