Java Programming Tutorials

Java Programming Tutorials And Articles
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What Is GlassFish? Depending on how you look at it, GlassFish is any of the following: A community. The GlassFish community currently includes over 1100 members participating in the GlassFish project, with the objective of developing an open source application server that implements Java EE...
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Drawing Lines The drawLine method belongs to the Graphics class. This example draws a fan of twenty lines from the bottom center of the Applet along the top edge. The applet's getSize method is used to find the dimensions of the applet. import java.awt.*; import java.applet.*; public...
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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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The JavaMail API (http://java.sun.com/products/javamail/) is a messaging framework intended to build platform-independent applications that use e-mail messaging. It is included in the J2EE platform and is available as an optional package in J2SE. The API's main purpose is not for transporting,...
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Earlier in client- server computing, each application had its own client program and it worked as a user interface and need to be installed on each user's personal computer. In web applications we mostly use HTML/XHTML which is mostly supported by all the browsers and web page is displayed to the...
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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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Just like the multiple catch blocks, we can also have multiple try blocks. These try blocks may be written independently or we can nest the try blocks within each other, i.e., keep one try-catch block within another try-block. The program structure for nested try statement is: try { //...
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Java defines several built-in classes for exception handling. All these classes are a part of the java.lang package which is automatically imported. That is why, while throwing an exception you did not specifically include any package for exception classes. Apart from the built-in exception...
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The exception handling mechanism is a cleaner way to impose check upon the conditions which may lead to errors. But you should not be carried away by it and start using exception handling anywhere and everywhere you want. Exceptions must be carefully planned and implemented. The following cases...
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Introduction Java environment has been built around the multithreading model. In fact all Java class libraries have been designed keeping multithreading in mind. If a thread goes off to sleep for some time, the rest of the program does not get affected by this. Similarly, an animation loop can...
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Introduction JavaServer Faces solves many of the historical problems of Java Web development by providing a clean implementation of the Model-View-Controller design pattern while providing a productive, component-centric development without sacrificing development power and flexibility....
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A thread can be created in Java programs in two ways – by extending Thread class and by implementing Runnable interface. In case, where the class extends a Tread class, it must override run() method of the Thread class. The program may override the other methods also. If the program uses Runnable...
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Struts is a free open-source framework for creating Java web applications. Web applications differ from conventional websites in that web applications can create a dynamic response. Many websites deliver only static pages. A web application can interact with databases and business logic engines...
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Java.io package provides classes for system input and output through data streams, serialization and the file system. Some of important and popular classes of java.io package are given below: Java.io.BufferedInputStream Class Java.io.BufferedOutputStream Class Java.io.BufferedReader Class...
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