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Java: Most Popular Articles

These articles are the most popular over the last month.
Understanding Java's 'Cannot Find Symbol' Error...
Cannot Find Symbol is a compile-time error.
How to Declare Variables in Java
The use of variables is key to any program. Learn how to declare and initialize variables in Java.
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 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. Page 2.
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.
A Simple Guide to Creating Basic JFrame Windows
How to use JFrame to create a simple window for a Java application.
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 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 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.
Simple Message Dialog Boxes Program
Example Java program code for how to make simple message dialog boxes using the JOptionPane class.
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.
What is Aggregation?
Aggregation is a relationship between two objects that is best described as a
Understanding Reserved Object Variable Words in...
Here you will find a list of words that you cannot use as identifiers in a Java program.
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.
A Simple Table Example Java Code Program
An example program showing how to use the JTable class
Identifier
An identifier is simply a name given to a package, class, interface, method, or variable.
Static Fields
Fields can be shared across all objects of the same type through the use of the static modifier.
Method Signature
A method signature is part of the method declaration. It is the combination of the method name and the parameter list.
A KeyListener Example Program
An example program showing how to implement the KeyListener interface.
What Is Unicode?
Learn about the Unicode standard, a global way to encode the characters that computers use.
A Progress Bar Example Program
An example Java program showing how to use the JProgressBar
Static Method
Static methods are created using the static keyword.
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 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.
Creating a Message Dialog Box - Part I
Learn how to use the JOptionPane class to make a simple message dialog box
DefaultTableModel Example Program
An example program to show the DefaultTableModel in action.
How to Create a Simple Table
A look at the JTable class and how it can be used to make simple tables for GUIs
Common Runtime Error
See if you can debug a piece of code that produces one of the most fundamental Java runtime errors.
Use Java to Generate Unique Random Numbers
Sometimes the random numbers to be picked need to be unique.
Input Dialog Box Program
Example Java program code to make several different types of input dialog boxes using the showInputDialog method of JOptionPane.
Implicit Parameter
In a method call the implicit parameter is the object the method belongs to.
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.
Variable
A variable is a container that holds values that are used in a Java program.
Using Command-line Arguments
How to make use of command-line arguments in your Java applications.
Ternary Operator
The ternary operator ?: earns its name because it's the only operator to take three operands.
Declaration Statement
Declaration statements are used to declare variables.
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.
Scope
Scope refers to the lifetime and accessibility of a variable. How large the scope is depends on where a variable is declared.
Association
The association relationship is a way of describing the fact that a class knows about, and holds a reference to another class.
How to Implement Java Comments
Enhance the readability of your programs by using Java comments.
How to Convert Strings to Numbers and Vice...
How to convert Strings to numbers and back again.
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.
What Java 'PACKAGES' Are and How to Use Them
Bring a sense of order to your classes through the use of packages.
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.
How to Code a Password Dialog Program in Java
Example Java program code for creating a simple password dialog box.
Void
The void keyword denotes that a method does not have a return type.
How to Use Java Packages
Learn how to include the functionality of packaged classes into your programs.
An Easy Guide to Using 'CARDLAYOUT' Elements in...
A simple application showing how the CardLayout can be used to switch JPanels.
Odd Magic Squares
Turtles, magic and squares will conspire to test your logic in this exercise.
What 'Concatenation' Is in Java Terms
Concatenation describes the operation of joining two strings together.
Fun With Strings Example Code
A Java program to show the String class in action.
Superclass
A superclass is a class that has been extended by another class.
Parameter
Parameters are the variables that are listed as part of a method declaration.
Understanding 'Primitive Data Types' in Java
The Java language provides eight primitive data types that define simple values a program can use.
ActionListener
The ActionListener interface is an event listener for actions performed by some graphical components.
Object
An object is an instance of a class.
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.
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.
GridPane Example Program
An overview of how to use the GridPane to make a table format.
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.
Compound Assignment Operator
Compound assignment operators provide a shorter syntax to assign the results of the arithmetic and bitwise operators.
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.
Working with Arrays
How to make use of arrays. Java.
Data Encapsulation
Find out about data encapsulation, the most important concept of object-oriented programming.
BoxLayout Example Program
An example Java program showing a simple application using the BoxLayout.
Constructor Chaining
Constructor chaining occurs through the use of inheritance.
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.
Conditional Operator
Conditional operators are used to evaluate a condition that's applied to one or two boolean expressions.
Understanding 'Overloading' In Java
Overloading is the ability to define more than one method with the same name in a class.
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.
Install the Java SE Development Kit
Step-by-Step instructions on how to install the latest version of the JDK.
Event
An event typically occurs when a user interacts with a user interface.
How to Use an 'ArrayList' in Java
How to use the ArrayList class. Java.
The String Literal
String Literals are used for representing string values in Java code.
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.
TreeView Example Program
Example Java code showing how the TreeView JavaFX control is used.
Loops
Loops are a way of executing the same code block many times.
ListView and ComboBox Example Program
Example Java code showing how the ListView and ComboBox JavaFX controls can be used.
Expression
Expressions are essential building blocks of any Java program. They are built using values, variables, operators and method calls.
Statement
If expressions are akin to clauses in the English language, then statements are like sentences.
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.
Disabling (or Enabling) the Java Plugin in a...
Here are the steps to disable (or enable) the Java plugin in a browser.
Use This Example Code to Create Your Own Binary...
Example code for reading and writing to a binary file one byte at a time.
Creating A Simple Calculator to Handle Button...
Building an interface for a simple calculator program
Denary
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.
ItemListener Example Code Program
Example Java code showing the ItemListener event listener in action
JavaFX CSS Example Program
This example code shows how to simply switch between two JavaFX stylesheets.
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.
Definition for the Java Term: Event Listener
An event listener receives and process events.
Compiler
A Java compiler translates the Java code written by a programmer into instructions a computer can execute.
GridLayout Example Program
Example Java code to show how the GridLayout, the BorderLayout and the BoxLayout can be used to make a customizable graphical user interface for a simple calculator.
Conditional Statements
Conditional statements enable a program to make a decision and preform an action based on that decision.
How to Use 'Gridlayout' in Java
A look at how to use the GridLayout layout manager.
Constant
A constant is a variable whose value cannot change once it has been assigned.
Source Code
Source code refers to the programming instructions used to create an application.
Main Method
The main method is the starting point for the execution of every Java application.
Using the Switch Statement for Multiple Choices
Use the switch statement when you want your program to chose between a number of alternative options.
Deleting, Copying and Moving Files
How to delete, copy and move files using nio.2
BorderLayout Example Program
An example program to show how to code a BorderLayout layout manager with assigned horizontal and vertical spacing.
Class
A class specifies the design of an object.
How to Read and Write Byte Streams
Learn how to read bytes from a binary file one byte at a time.
GridPane Overview
How to use the GridPane layout to place child nodes in a grid format.
Using Inheritance
Discover how a class can inherit the state and behaviors of 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.
Operand
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.
The Infinite Loop
Can you rewrite this Java code so that there is no longer an infinite loop?
How to Create a 'GridBagLayout' in Java (Guide...
Example code showing how the GridBagLayout layout manager can be used to position components.
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.
BorderPane Example Program
An example of how to use the JavaFX BorderPane layout
How to Create an Option Chooser App with...
An example Java application which allows the user to combine various JOptionPane options to show example dialog boxes.
Understanding 'Hailstone' Sequences in Java
A clever German mathematician created a simple formula that will produce what is sometimes known as the hailstone sequence. Can you write a program to display that sequence for a certain number?
ComboBox Overview
A look at the JavaFX ComboBox class.
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.
Composition
The term composition takes on different meanings depending on the subject, and in Java it has its own meaning as well.
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.
The try-catch-finally blocks
Java handles exception through the use of the try-catch-finally blocks
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.
ListView Overview
A look at the JavaFX ListView class
How to Use a 'Key Listener Interface' (Java...
How to implement the Key Listener Interface, which provides the ability to find out what keys a user is pressing while a graphical component has the focus of the graphical user interface.
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.
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.
JNLP
A look at the Java Network Launch Protocol
GUI
A GUI is the graphical interface presented to the user of an application.
ChoiceBox Overview
A look at the JavaFX ChoiceBox class
TextField Overview
A look at the JavaFX TextField class
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.
Deprecated
When a new version of an API is released it's quite common for parts of it to become deprecated.
What Is Netbeans?
NetBeans is a sophisticated IDE that aims to help developers build any type of application.
Literal
A literal is a value that can be written directly into Java source code.
Using the BorderLayout
An overview of the BorderLayout layout manager.
Capturing Mouse Events Example Program
An example program showing how to implement the three mouse event listeners
How to Handle Mouse Events
A step-by-step by guide implementing the MouseListener, MouseMotionListener, and MouseWheelListener event listeners using a simple gui application.
Strongly Typed
Java is a strongly typed programming language because every variable must be declared with a data type.
Lesson 1 - Getting Started
The focus of this lesson is setting up Java on your computer, finding a Java editor to use, writing a simple Java program and to have a simple look at how to deal with errors.
Playing With Wrappers
Play around with wrapper classes in this simple exercise.
Manipulating Strings
The string class provides a few methods for manipulating Strings.
JLabel
A JLabel is used to explain the purpose of other graphical components in a graphical user interface.
What Is JavaFX?
Find out what JavaFX is and what it can be used to create.
Using the Arrays Class
How to use the Arrays class to manipulate Arrays
Build a Simple Robocode Robot
It's time for some robot carnage.
Arithmetic Operator
Arithmetic operators perform the same basic operations you would expect if you used them in mathematics (with the exception of the percentage sign).
Garbage Collection
Garbage collection frees up memory that is no longer in use.
TreeView Overview
A look at the JavaFX TreeView class

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