Java Programming Tutorials

Java Programming Tutorials And Articles
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All the three keywords final, finally and finalize() plays a very important role in JAVA. Final is a keyword used for declaration of variable which cannot be edited, finally is a segment of code used for code cleanup in case of an exception whereas finalize is a method used for object cleanup...
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Since JDK version 5.0, a new mechanism was introduced in Java that enables us to include additional information (known as metadata) directly into the java source code. This information is termed as Annotations. In English dictionary, Annotation means “a note by way of explanation or comment added...
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Introduction Buffers can be very useful in Java since they speed up I/O operations considerably. Basically a buffer is a space allocated in memory for Bytes, Chars, and other data types to be stored. Buffers are really useful while writing Client/ Server applications. Creating a Buffer A...
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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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Introduction The 'main()' method in Java is referred to the thread that is running, whenever a Java program runs. It calls the main thread because it is the first thread that starts running when a program begins. Other threads can be spawned from this main thread. The main thread must be the...
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One of the prime features of object oriented programming is data encapsulation.This feature enables data to have restricted access.There are currently four different access specifiers in JAVA. Namely, Public Protected Default Private Public:- All the data members and member functions...
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JDBC (Java Database Connectivity) is an API (Application Programming Interface) which is used to connect java to any database. It is used to communicate with various types of databases such as Oracle, MS Access, My SQL and SQL Server. It is a platform-independent interface between Java and...
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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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Introduction In the last article on servlet, we noted that HTTP is the protocol most-commonly used to communicate with web applications. Unfortunately, HTTP offers no mechanism for data to be retained between requests; in other words it can't track the activities of a user across requests. ...
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In the previous article we discussed three examples, each of which demonstrates how to track user sessions programmatically, using URL rewriting, cookies, and hidden form fields respectively. Each of these techniques required some unique string to be exchanged between the client and the server, so...
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Some Examples are same from Java AWT Reference and is because when I did those in my college days referred many sources. Introduction Graphics in any language gives a wonderful look and feel to the users as well as programmers. Programmers draw figures, strings etc with the help of...
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In the previous two articles I discussed all essential features and methods of applet. Here I give some examples which would clear your concept about applets. A Font List Example This is an example of an applet that displays the standard fonts and styles. import java.applet.*; import...
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Introduction Applets are event-driven programs. Event handling is at the core of successful applet programming. Most events to which an applet will respond are generated by the user. There are several types of events. The most commonly handled events are those generated by the mouse, the...
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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 The instances of the String class represent a string that cannot be modified. If we do want to create modifiable strings because we are going to do lots of string manipulation, we should use the java.lang.StringBuffer and java.lang.StringBuilder classes.If we choose to do a lot of...
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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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Java.lang package contains the classes that are fundamental to the design of the Java programming language. Java.lang.Character Class Java.lang.Float Class Java.lang.Integer Class Java.lang.Character Class The java.lang.Character class wraps a value of the primitive type char in an...
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Java.util package contains the collections framework, legacy collection classes, event model, date and time facilities, and miscellaneous utility classes. Java.util.ArrayList Class Java.util.Calendar Class Java.util.HashMap Class Java.util.ArrayList Class The java.util.ArrayList class...
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A specific instant in time is represented with millisecond precision by the Date class. Date is interpreted as year, month, day, hour, minute, and second values using this class. But API for functions of this class was not so flexible and hence was not supported at international level. Also for JDK...
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