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Introduction
Assertion facility is added in J2SE 1.4. In order to support this facility J2SE 1.4 added the keyword assert to the language, and AssertionError class. An assertion checks a boolean-typed expression that must be true during program runtime execution. The assertion facility can be...
By S k
Last Message By Balaji
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The classical input/output (I/O) library in Java contains classes that support I/O handling of streams with compressed data. You can easily compress and decompress any text or binary data to or from any I/O stream using either a file or any other stream (e.g., a servlet output stream). In this...
By Mary
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JNode, a "Java New OS Design Effort" is an open source all java operating system. It is a modern OS with support for modern hardware devices intended to be simple to use, install & maintain on personal devices such as desktops, tablet pcs and handhelds.
JNode has started out many years ago as...
By Tango Issac Debian
Last Message By shabbir
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7
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What is an EJB?
An Enterprise JavaBean (EJB) is a reusable, portable J2EE component. EJBs consist of methods that encapsulate business logic. For example, an EJB may have business logic that contains a method to update customer data in a database. A variety of remote and local clients can invoke...
By Sanskruti
Last Message By satyedra pal
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Exception is an abnormal condition that arises in the program during execution. When such a condition arises in the program, an appropriate code is written so that it can be handled. It is very much similar to the error codes returned by a subroutine in the C language. Whatever value the function...
By Sanskruti
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Introduction
The code which is expected to generate the exception must be enclosed in the try and catch block. The very basic form of the exception-handling block is as following:
try
{
//code which is expected to generate the exception
}
catch (<ExceptionTypeClass> object)
{...
By Sanskruti
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Before you can catch an exception, some code somewhere must throw one. Any code can throw an exception: your code, code from a package written by someone else such as the packages that come with the Java platform, or the Java runtime environment. Regardless of what throws the exception, it's always...
By Sanskruti
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The finally clause is written with the try-catch statement. It is guarenteed to be executed after a catch block or before the method quits.
try
{
// statements
}
catch (<exception> obj)
{
// statements
}
By Sanskruti
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You have seen that an exception is thrown either implicitly in the try block and there is a catch block ready to handle it. But, there are methods, which throw the exception, but do not catch it within the method body. In this case the method which is throwing the exception must use a throws clause...
By Sanskruti
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We can create a thread in Java by extending Thread Class. A better way to create a thread in Java is to implement Runnable interface. A thread can be created by extending Java Thread class also. Now the question arises why implementing Runnable interface is a better approach? Answer is, if the...
By Sanskruti
Last Message By prabhas4
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This article demonstrates how to write a simple Stateful Session Bean. It consists of three POJO's: Remote interface Cart.java, Bean class CartBean.java and EJB client CartClient.java.
Prerequisites
In order to complete the example application, you should be familiar with the following:
*...
By Sanskruti
Last Message By Sujata420
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Objects in Java are referred using reference types, and there is no direct way to copy the contents of an object into a new object.
The assignment of one reference to another merely creates another reference to the same object. Therefore, a special clone() method exists for all reference...
By pradeep
Last Message By javaexp
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This is a basic digital clock in Java that works off your operating system time, it works in a multithreaded environment and have coded it to put my own background in.
import java.awt.*;
import javax.swing.*;
import java.util.*;
class Clock extends JFrame implements Runnable
{
...
By Systemerror
Last Message By rkudoz
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6
54,731 |
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Introduction
A package is a namespace that organizes a set of related classes and interfaces to provide access protection and namespace management.You can think of packages as being similar to different folders on your computer. Software written in the Java programming language can be...
By techgeek.in
Last Message By herandez21
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In the first part I discussed about applet fundamentals as to what is an applet, its features, various methods of Applet class and a simple example on applet. In this article I will discuss further on advanced features of applet.
Applet class
Applet class provides all necessary support for...
By techgeek.in
Last Message By TPrice
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Introduction
Java can be used to create two types of programs: applications and applets. An application is a program that runs on a computer, under the operating system of that Computer just like the one created using C or C++.
An applet is an application that is accessed on the...
By techgeek.in
Last Message By suman52
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Layout Managers
In the previous article I discussed about the various Controls in Java like Button, Checkbox, Lists, Scrollbars, Text Fields, and Text Area etc. All of these components have been positioned by the default layout manager. A layout manager automatically arranges the controls within...
By techgeek.in
Last Message By shabbir
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Introduction
As we already know the primitive data type char represents a character. A chain of characters is called a string. The capability to handle strings is an important feature of any programming language. In Java, each character in a string is a 16-bit Unicode character.Because Unicode...
By techgeek.in
Last Message By kcrislyn
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The String class is used to manipulate character strings that cannot be changed. In simple terms, objects of type String are read only and immutable. The StringBuffer class is used to represent characters that can be modified. The significant performance difference between these two classes is that...
By techexplorer
Last Message By andrewgibs
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Here, these two codes are used to shows the difference between normal MultiThreading and Synchronized Multithreading. Notice, see the difference in the starting and finishing of all the threads in both the code and try to find why every time when you run the program code, random thread starts...
By manish174
Last Message By Omkarkarne
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