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Java: Most Popular Articles

These articles are the most popular over the last month.
Example Java Code For Building a Simple GUI...
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 Generate Random Numbers
Learn how to generate random numbers using the java.util.Random class.
How To Determine if Your Computer Is 32-Bit or...
Follow these steps if you want to find out if your computer is 32-bit or 64-bit.
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 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.
Declaring Variables
The use of variables is key to any program. Learn how to declare and initialize variables in Java.
Error Message: Cannot Find Symbol
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.
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.
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 4.
A Simple Guide to Creating Basic JFrame Windows
How to use JFrame to create a simple window for a Java application.
A Simple Table Example Java Code Program
An example program showing how to use the JTable class
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.
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.
A KeyListener Example Program
An example program showing how to implement the KeyListener interface.
A Progress Bar Example Program
An example Java program showing how to use the JProgressBar
Aggregation
: Aggregation is a relationship between two classes that is best described as a "has-a" and "whole/part"
Converting Strings to Numbers and Vice Versa
How to convert Strings to numbers and back again.
Creating a Message Dialog Box - Part I
Learn how to use the JOptionPane class to make a simple message dialog box
Designing and Creating Objects
Follow this step-by-step guide to learn how to design and create an object. Page 6.
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.
Using the ArrayList
How to use the ArrayList class. Java.
Reserved Words in Java
Here you will find a list of words that you cannot use as identifiers in a Java program.
What Is Java?
Find out what Java is, who created it, and why people choose to program with it.
DefaultTableModel Example Program
An example program to show the DefaultTableModel in action.
Input Dialog Box Program
Example Java program code to make several different types of input dialog boxes using the showInputDialog method of JOptionPane.
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.
The if-then and if-then-else statements
Use the if-then and if-then-else statements when your program needs to make a simple decision about what to do next.
Example JavaFX code for Building a Simple GUI...
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.
Static Fields
Fields can be shared across all objects of the same type through the use of the static modifier.
Using a KeyListener Interface
How to implement the Key Listener Interface.
Generating Unique Random Numbers
Sometimes the random numbers to be picked need to be unique.
Working with the GridLayout
A look at how to use the GridLayout layout manager.
What Is Inheritance?
Learn about object inheritance and how it can be used to create a relationship between objects that share common characteristics.
Using the Switch Statement for Multiple Choices
Use the switch statement when you want your program to chose between a number of alternative options.
BoxLayout Example Program
An example Java program showing a simple application using the BoxLayout.
Using Command-line Arguments
How to make use of command-line arguments in your Java applications.
Identifier
An identifier is simply a name given to a package, class, interface, method, or variable.
Method Signature
A method signature is part of the method declaration. It is the combination of the method name and the parameter list.
Capturing Mouse Events Example Program
An example program showing how to implement the three mouse event listeners
Password Dialog Box Program
Example Java program code for creating a simple password dialog box.
BorderLayout Example Program
An example program to show how to code a BorderLayout layout manager with assigned horizontal and vertical spacing.
JavaFX CSS Example Program
This example code shows how to simply switch between two JavaFX stylesheets.
Java Comments – Using Implementation...
Enhance the readability of your programs by using Java comments.
CardLayout Example Program
A simple application showing how the CardLayout can be used to switch JPanels.
Building an Input Dialog Box
Find out how to use the showInputDialog method of the JOptionPane class to make different kinds of input dialog boxes.
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.
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.
Static Method
Static methods are created using the static keyword.
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.
GridBagLayout Example Program
Example code showing how the GridBagLayout layout manager can be used to position components.
What Is a Package?
Bring a sense of order to your classes through the use of packages.
Association
The association relationship is a way of describing the fact that a class knows about, and holds a reference to another class.
Deleting, Copying and Moving Files
How to delete, copy and move files using nio.2
What Is Unicode?
Learn about the Unicode standard, a global way to encode the characters that computers use.
Binary Stream Example Code
Example code for reading and writing to a binary file one byte at a time.
Types of Exceptions
There are three different types of exceptions a Java application might encounter.
ActionListener
The ActionListener interface is an event listener for actions performed by some graphical components.
Primitive Data Types
The Java language provides eight primitive data types that define simple values a program can use.
Coding a Simple Graphical User Interface - Part I
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.
Using the BorderLayout
An overview of the BorderLayout layout manager.
ItemListener Example Code Program
Example Java code showing the ItemListener event listener in action
JavaFX With FXML Using SceneBuilder and NetBeans
How to create a simple JavaFX FXML application using NetBeans and Scene Builder.
Scope
Scope refers to the lifetime and accessibility of a variable. How large the scope is depends on where a variable is declared.
Superclass
A superclass is a class that has been extended by another class.
Using Packages
Learn how to include the functionality of packaged classes into your programs.
Object
An object is an instance of a class.
Common Runtime Error
See if you can debug a piece of code that produces one of the most fundamental Java runtime errors.
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.
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.
Install the Java SE Development Kit
Step-by-Step instructions on how to install the latest version of the JDK.
Reached End of File While Parsing
Reached end of file while parsing is a compile time error.
Fun With Strings Example Code
A Java program to show the String class in action.
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.
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.
Class
A class specifies the design of an object.
The String Literal
String Literals are used for representing string values in Java code.
TreeView Example Program
Example Java code showing how the TreeView JavaFX control is used.
ListView and ComboBox Example Program
Example Java code showing how the ListView and ComboBox JavaFX controls can be used.
Definition for the Java Term: Event Listener
An event listener receives and process events.
Composition
The term composition takes on different meanings depending on the subject, and in Java it has its own meaning as well.
JOptionPane Option Chooser Program
An example Java application which allows the user to combine various JOptionPane options to show example dialog boxes.
Concatenation
Concatenation describes the operation of joining two strings together.
How to Make a Password Dialog Box
Any application providing a secure environment for a user needs to be able to safely obtain the password for that user.
Working with Arrays
How to make use of arrays. Java.
Using the FlowLayout
A look at the most common properties of the FlowLayout layout manager.
The try-catch-finally blocks
Java handles exception through the use of the try-catch-finally blocks
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.
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.
Event
An event typically occurs when a user interacts with a user interface.
java.lang.NoClassDefFoundError
java.lang.NoClassDefFoundError is a runtime error.
How to Read and Write Byte Streams
Learn how to read bytes from a binary file one byte at a time.
GridPane Example Program
An overview of how to use the GridPane to make a table format.
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.
Conditional Operator
Conditional operators are used to evaluate a condition that's applied to one or two boolean expressions.
BorderPane Example Program
An example of how to use the JavaFX BorderPane layout
Modeless Dialog Program
Example Java program code showing two ways to make a modeless dialog using JDialog.
Ternary Operator
: The ternary operator "?:" earns its name because it's the only operator to take three operands . It
The JTable Table Model
A look at the table model behind the JTable
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.
DefaultTableModel Overview
An overview of the DefaultTableModel Java class
Disabling (or Enabling) the Java Plugin in a...
Here are the steps to disable (or enable) the Java plugin in a browser.
ComboBox Overview
A look at the JavaFX ComboBox class.
ListView Overview
A look at the JavaFX ListView class
How to Create a Simple Table
Using a table model to create the JTable. Page 3.
Creating A Simple Calculator to Handle Button...
Implement the ActionListener Interface As An Inner Class. Page 5.
Variable
A variable is a container that holds values that are used in a Java program.
Reading and Writing Character Streams
How to read and write to a text file one character at a time.
Void
The void keyword denotes that a method does not have a return type.
The Infinite Loop
Can you rewrite this Java code so that there is no longer an infinite loop?
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.
TextField Overview
A look at the JavaFX TextField class
Data Encapsulation
Find out about data encapsulation, the most important concept of object-oriented programming.
How to Handle Item Events
Handling item events triggered by ItemListener event listener through selecting and deselecting items from a JComboBox.
Coding a Simple Graphical Interface - Part III
Looking at the JavaFX program structure. Page 2.
Deprecated
When a new version of an API is released it's quite common for parts of it to become deprecated.
Odd Magic Squares
Turtles, magic and squares will conspire to test your logic in this exercise.
JFileChooser Overview
An overview of the JFileChooser class showing the most useful methods along with some usage tips.
Creating Labels Example Program
An example program showing how to create labels
Overloading
Overloading is the ability to define more than one method with the same name in a 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.
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.
How to Make a Modeless Dialog Box
By using the JDialog class you can create custom dialog boxes that can be modeless.
A FocusListener Example Program
An example Java program showing how to implement a FocusListener interface
Hexadecimal
Hexadecimal refers to a numbering system that has a base of 16. This means it uses all the numerals 0,1,2,3,4,5,6,7,8,9 as well as the letters A,B,C,D,E,F for each digit of a number.
Source Code
Source code refers to the programming instructions used to create an application.
Using the Arrays Class
How to use the Arrays class to manipulate Arrays
Implicit Parameter
In a method call the implicit parameter is the object the method belongs to.
Using Inheritance
Discover how a class can inherit the state and behaviors of another class.
TreeView Overview
A look at the JavaFX TreeView class
GridPane Overview
How to use the GridPane layout to place child nodes in a grid format.
Showing a Color Chooser Dialog
The JColorChooser class is used to create a detailed color chooser dialog.
How to Handle Mouse Events
How to implement the MouseListener by attaching it to a JLabel. Page 3.
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).
Implementing a FocusListener Interface
How to implement a Focus Listener interface to a class to listen for focus events.
The String Class
The String class lets you create and manipulate Strings.
How to Make a Progress Bar
How to make a progress bar using the JProgressBar class
Subclass
A subclass is a class that extends another class.
ToggleButton Example Program
Example Java code showing the ToggleButton in action.
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.
GUI Builder Code For Building a Simple GUI...
This Java code listing shows what is created by the NetBeans GUI Builder for the simple GUI application built in the Coding a Simple GUI Application - Part II.
Literal
A literal is a value that can be written directly into Java source code.
Constructor Chaining
Constructor chaining occurs through the use of inheritance.
Button Overview
A look at the JavaFX Button class
ToggleButton Overview
An look at the JavaFX ToggleButton class
Comparing Strings
There are several ways to compare two Strings.
Using the GridBagLayout
An overview of the GridBagLayout layout manager.
Manipulating Strings
The string class provides a few methods for manipulating Strings.
RadioButton Overview
A look at the JavaFX RadioButton class

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