Java Programming Tutorials

Java Programming Tutorials And Articles
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Here we go. This example is used to illustrate that “how we can use color class in java?” We several time need to color our panel, label, or form. For this java provide us Color class in awt package i.e “java.awt.Color.java”. This class has seven - number of constructor. But the widely used...
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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...
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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...
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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...
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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...
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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) {...
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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...
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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 }
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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...
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Introduction The code bound by the try block need not always throw a single exception. If in a try block multiple and varied exceptions are thrown, then you can place multiple catch blocks for the same try block in order to handle all those exceptions. When an exception is thrown it traverses...
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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: *...
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Here is a simple implementation of client-server using Java. There are two java files, one for client code and one for server code. The code is quite self-explanatory. FactorialClient.java /* ** A TCP based client that will send the number entered by the user for factorial ** ...
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In Java, networking is performed using Transmission Control Protocol/Internet Protocol (TCP/IP) or the User Datagram Protocol (UDP). Java provides a low-level control on the connection, allowing you to customize it according to your requirements. The package containing networking classes, called...
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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...
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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...
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In this article I will discuss about window and some advanced components which can be added to our window such as Menu Bars and Menus. Window Fundamentals The AWT defines windows according to a class hierarchy that adds functionality and specificity with each level. The two most common...
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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...
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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...
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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...
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What is an Abstract Class? A class defined in such a way such that it defines the basic structure of an object but does not provide any implementation details about at least one of its method. Any method in an abstract class which is devoid of any implementation details is called abstract...
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