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Java: Most Popular Articles

These articles are the most popular over the last month.
A Quick Guide to Using Constants Syntax in Java
Throughout the lifetime of a variable its value might change many times. But what if you know the value will never change? Or more importantly you want to make sure it can't change? This is when you need to use a constant.
Sample Java Code to Generate Random Numbers
Learn how to generate random numbers using the java.util.Random class.
A Quick Guide to Using Accessors and Mutators...
In object-oriented programming sometimes it's necessary to provide access to the private fields of an object. The use of accessors and mutators are a way to enable that access.
Sample Java Code for Building a Simple GUI App
An example Java class for building a simple GUI application. This program corresponds to the Coding a Simple Graphical User Interface - Part I
How to Declare Variables in Java
The use of variables is key to any program. Learn how to declare and initialize variables in Java.
Java Code Listing for a Simple Calculator
This program creates a simple calculator that performs addition and subtraction. It highlights how to implement the ActionListener interface in three different ways.
Wondering What Java Is? Here's the Answer
Find out what Java is, who created it, and why people choose to program with it.
A Simple Guide to Creating Basic JFrame Windows
How to use JFrame to create a simple window for a Java application.
Understanding Java's 'Cannot Find Symbol' Error...
Cannot Find Symbol is a compile-time error.
A Quick Guide to Using Naming Conventions in Java
Using standard Java naming conventions will increase the readability of your code and make it easier to maintain.
How to Write Java Source Code
Are you ready to start programming in Java? Follow this step-by-step tutorial to learn how to write, compile and run Java programs.
What is Aggregation?
Aggregation is a relationship between two objects that is best described as a
How to Tell If Your Computer is 32- or 64-Bit
Follow these steps if you want to find out if your computer is 32-bit or 64-bit.
Using Java Constructors: An Easy How-To Guide
When a new instance of an object is created the constructor method is called. Examples of how to create constructor methods in Java are discussed here.
Download and Install the Java SE Development Kit
Make your first Java download the right one. Step-by-Step instructions on how to download the latest version of the JDK.
Simple Message Dialog Boxes Program
Example Java program code for how to make simple message dialog boxes using the JOptionPane class.
Understanding Reserved Object Variable Words in...
Here you will find a list of words that you cannot use as identifiers in a Java program.
Ternary Operator
The ternary operator ?: earns its name because it's the only operator to take three operands.
Method Signature
A method signature is part of the method declaration. It is the combination of the method name and the parameter list.
An Easy Guide to Designing and Creating Objects...
Follow this step-by-step guide to learn how to design and create an object. Page 6.
A Simple Table Example Java Code Program
An example program showing how to use the JTable class
What Is Unicode?
Learn about the Unicode standard, a global way to encode the characters that computers use.
Static Fields
Fields can be shared across all objects of the same type through the use of the static modifier.
The association relationship is a way of describing the fact that a class knows about, and holds a reference to another class.
How to Code a Simple Graphical Interface in...
A step-by-step guide to manually coding a simple graphical user interface. Part two of this step-by-step shows how to code the same graphical user interface using NetBeans Gui Builder.
Types of Exceptions
There are three different types of exceptions a Java application might encounter.
DefaultTableModel Example Program
An example program to show the DefaultTableModel in action.
A Progress Bar Example Program
An example Java program showing how to use the JProgressBar
A KeyListener Example Program
An example program showing how to implement the KeyListener interface.
Use Java to Generate Unique Random Numbers
Sometimes the random numbers to be picked need to be unique.
How to Build a Simple GUI in JavaFX Code
An example JavaFX application to show how to build a simple graphical user interface. The interface is the same as those built using Swing in part 1 and NetBeans GuiBuilder in part two.
Everything You Need to Know to Build Your First...
Follow this step-by-step tutorial to learn how to write, compile and run Java applets.
How to Convert Strings to Numbers and Vice...
How to convert Strings to numbers and back again.
A variable is a container that holds values that are used in a Java program.
An identifier is simply a name given to a package, class, interface, method, or variable.
Creating a Message Dialog Box - Part I
Learn how to use the JOptionPane class to make a simple message dialog box
GridPane Example Program
An overview of how to use the GridPane to make a table format.
A superclass is a class that has been extended by another class.
Implicit Parameter
In a method call the implicit parameter is the object the method belongs to.
How to Implement Java Comments
Enhance the readability of your programs by using Java comments.
Static Method
Static methods are created using the static keyword.
How to Create a Simple Table
A look at the JTable class and how it can be used to make simple tables for GUIs
Scope refers to the lifetime and accessibility of a variable. How large the scope is depends on where a variable is declared.
How to Create an Input Dialog Box Using Java...
Find out how to use the showInputDialog method of the JOptionPane class to make different kinds of input dialog boxes.
Reached End of File While Parsing
Reached end of file while parsing is a compile time error.
Install the Java SE Development Kit
Step-by-Step instructions on how to install the latest version of the JDK.
The ActionListener interface is an event listener for actions performed by some graphical components.
Common Runtime Error
See if you can debug a piece of code that produces one of the most fundamental Java runtime errors.
Wondering What "Inheritance" Is in Programming?...
Learn about object inheritance and how it can be used to create a relationship between objects that share common characteristics.
The void keyword denotes that a method does not have a return type.
Disabling (or Enabling) the Java Plugin in a...
Here are the steps to disable (or enable) the Java plugin in a browser.
Introduction to Object-Oriented Programming
Understanding object-oriented programming is fundamental to becoming a truly great Java programmer. The key concepts of objects are discussed in this article.
Declaration Statement
Declaration statements are used to declare variables.
An Easy Guide to Using 'CARDLAYOUT' Elements in...
A simple application showing how the CardLayout can be used to switch JPanels.
How Do I Start Learning Java?
A common question new developer are faced with, is where do I start when faced with learning the Java language? Here are some tips.
Build a Simple Robocode Robot
It's time for some robot carnage.
What Java 'PACKAGES' Are and How to Use Them
Bring a sense of order to your classes through the use of packages.
How to Prevent Inheritance
Some classes are designed not to be extended by other classes. Find out how to prevent a class being inherited by another.
BorderPane Example Program
An example of how to use the JavaFX BorderPane layout
How to Use "IF-THEN" and "IF-THEN-ELSE"...
Use the if-then and if-then-else statements when your program needs to make a simple decision about what to do next.
Parameters are the variables that are listed as part of a method declaration.
Input Dialog Box Program
Example Java program code to make several different types of input dialog boxes using the showInputDialog method of JOptionPane.
Working with Arrays
How to make use of arrays. Java.
Beginner's Guide to Using an IDE Versus a Text...
Before you start to learn Java, you need somewhere to write your programs. Here's a guide to using an IDE versus a text editor.
How to Code a Password Dialog Program in Java
Example Java program code for creating a simple password dialog box.
BoxLayout Example Program
An example Java program showing a simple application using the BoxLayout.
Understanding 'Primitive Data Types' in Java
The Java language provides eight primitive data types that define simple values a program can use.
What 'Concatenation' Is in Java Terms
Concatenation describes the operation of joining two strings together.
Definition for the Java Term: Event Listener
An event listener receives and process events.
An object is an instance of a class.
Using Command-line Arguments
How to make use of command-line arguments in your Java applications.
Java Is Case Sensitive
When coding in Java it's important to remember that Java is case sensitive. Here are some tips to avoid common case sensitivity pitfalls.
Fun With Strings Example Code
A Java program to show the String class in action.
Use This Example Code to Create Your Own Binary...
Example code for reading and writing to a binary file one byte at a time.
Odd Magic Squares
Turtles, magic and squares will conspire to test your logic in this exercise.
The String Literal
String Literals are used for representing string values in Java code.
Data Encapsulation
Find out about data encapsulation, the most important concept of object-oriented programming.
A class specifies the design of an object.
Conditional Operator
Conditional operators are used to evaluate a condition that's applied to one or two boolean expressions.
ItemListener Example Code Program
Example Java code showing the ItemListener event listener in action
How to Generate Random Numbers (Part II)
Following on from the first article on generating random numbers in Java, find out how to generate random fractional numbers and boolean values.
An event typically occurs when a user interacts with a user interface.
Coding a Simple Graphical User Interface - Part...
This step-by-step guide shows how to build the simple GUI application created in Coding a Simple Graphical User - Part I using the NetBeans GUI Builder.
Creating A Simple Calculator to Handle Button...
Building an interface for a simple calculator program
Everything You Need to Know About Java on Mac...
Things are a little different for Java developers on Mac OS X. Find out how Java fits in with Apple computers.
Deleting, Copying and Moving Files
How to delete, copy and move files using nio.2
Compound Assignment Operator
Compound assignment operators provide a shorter syntax to assign the results of the arithmetic and bitwise operators.
Understanding 'Overloading' In Java
Overloading is the ability to define more than one method with the same name in a class.
A subclass is a class that extends another class.
Using Multiple Main Classes
Whilst learning Java the best way is to compile and run example code. Using multiple classes within a NetBeans project means you can keep all your code examples in one place and try them out independently of each other.
TreeView Example Program
Example Java code showing how the TreeView JavaFX control is used.
Using the Switch Statement for Multiple Choices
Use the switch statement when you want your program to chose between a number of alternative options.
The term composition takes on different meanings depending on the subject, and in Java it has its own meaning as well.
ListView and ComboBox Example Program
Example Java code showing how the ListView and ComboBox JavaFX controls can be used.
JavaFX CSS Example Program
This example code shows how to simply switch between two JavaFX stylesheets.
ComboBox Overview
A look at the JavaFX ComboBox class.
GridPane Overview
How to use the GridPane layout to place child nodes in a grid format.
Strongly Typed
Java is a strongly typed programming language because every variable must be declared with a data type.
Java Platforms
Java technology recognizes that developers build different applications based on the differing needs of their users. Discover the different editions of the Java platform available to developers.
Loops are a way of executing the same code block many times.
A GUI is the graphical interface presented to the user of an application.
How to Use Java Packages
Learn how to include the functionality of packaged classes into your programs.
How to Use an 'ArrayList' in Java
How to use the ArrayList class. Java.
ListView Overview
A look at the JavaFX ListView class
DefaultTableModel Overview
An overview of the DefaultTableModel Java class
A constant is a variable whose value cannot change once it has been assigned.
The denary (or decimal) numbering system is the most widely used in the world. It has a base of 10 and uses the numerals 0,1,2,3,4,5,6,7,8,9.
The arguments that have an operation performed on them by an operator are called operands.
JavaFX With FXML Using SceneBuilder and NetBeans
How to create a simple JavaFX FXML application using NetBeans and Scene Builder.
Color Chooser Program
Example Java program code that shows the two static methods of the JColorChooser class in action to make a color chooser dialog box.
How to Use 'Gridlayout' in Java
A look at how to use the GridLayout layout manager.
Using the BorderLayout
An overview of the BorderLayout layout manager.
Constructor Chaining
Constructor chaining occurs through the use of inheritance.
A Java compiler translates the Java code written by a programmer into instructions a computer can execute.
java.lang.NoClassDefFoundError is a runtime error.
FlowLayout Example Program
Example Java code for a program which provides a user with options to change the alignment and spacing of components in a FlowLayout layout manager.
If expressions are akin to clauses in the English language, then statements are like sentences.
Capturing Mouse Events Example Program
An example program showing how to implement the three mouse event listeners
BorderLayout Example Program
An example program to show how to code a BorderLayout layout manager with assigned horizontal and vertical spacing.
Playing With Wrappers
Play around with wrapper classes in this simple exercise.
Java 7 (and beyond) and the Mac OS X
Since Java 7 the version of Java for the Mac OS X now comes from Oracle.
A Beginner's Guide to Using NetBeans
If you're new to programming and want to find out what it's like to use an IDE, this is the guide for you. Learn how to write a simple Hello NetBeans World program using the NetBeans IDE.
What Is an Exception?
Find out what an exception is and how Java handles them.
A New Beginning
I'm Jeff Friesen and will be serving as your new Java expert. In this article, I present my initial plans for the java.about.com website.
JavaFX: TilePane Example Program
An example program showing how to use the JavaFX layout
Expressions are essential building blocks of any Java program. They are built using values, variables, operators and method calls.
Source Code
Source code refers to the programming instructions used to create an application.
The Infinite Loop
Can you rewrite this Java code so that there is no longer an infinite loop?
An API provides functionality for developers to use in their applications.
File Dialog Box Program
Example Java program code to show how the JFileChooser class is used to present an open file dialog box and save file dialog box to a user.
Object-Oriented Programming
All the articles and tutorials concerning object-oriented programming are brought together in once place.
Event Source
An event source is a component that triggers an event from some action performed on it.
How to Make a Password Dialog Box Using Java...
Any application providing a secure environment for a user needs to be able to safely obtain the password for that user.
Coding a Simple Graphical Interface - Part III
Looking at the JavaFX program structure. Page 2.
Main Class
A main class is a class that contains a main method
A modifier is a keyword placed in a class, method or variable declaration that changes how it operates.
ChoiceBox Overview
A look at the JavaFX ChoiceBox class
TextField Overview
A look at the JavaFX TextField class
Creating a Message Dialog Box - Part II
See how to create a message dialog box when you want the user to confirm a message with a Yes or OK.
How to Create a 'GridBagLayout' in Java (Guide...
Example code showing how the GridBagLayout layout manager can be used to position components.
When a new version of an API is released it's quite common for parts of it to become deprecated.
The try-catch-finally blocks
Java handles exception through the use of the try-catch-finally blocks
The JTable Table Model
A look at the table model behind the JTable
What Is JavaFX?
Find out what JavaFX is and what it can be used to create.
How to Handle Mouse Events
How to implement the MouseListener by attaching it to a JLabel. Page 3.
Showing a Color Chooser Dialog
The JColorChooser class is used to create a detailed color chooser dialog.
What Is Netbeans?
NetBeans is a sophisticated IDE that aims to help developers build any type of application.
It’s a way of designing an application that separates data access, business logic and the graphical user interface.
Main Method
The main method is the starting point for the execution of every Java application.
The Structure of Java Program - Hello NetBeans...
A basic look at the structure of a very simple Java program. This article gives a beginner a starting place for understanding the way the Java syntax builds to make a Java program.

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