Java: Most Popular Articles
Learn how to generate random numbers using the java.util.Random class.
Cannot Find Symbol is a compile-time error.
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.
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.
The use of variables is key to any program. Learn how to declare and initialize variables in Java.
An example Java class for building a simple GUI application. This program corresponds to the Coding a Simple Graphical User Interface - Part I
This program creates a simple calculator that performs addition and subtraction. It highlights how to implement the ActionListener interface in three different ways.
How to use JFrame to create a simple window for a Java application.
Using standard Java naming conventions will increase the readability of your code and make it easier to maintain.
Most programs that you run on your computer are windowed applications. Learn how to open a terminal window to run your Java program.
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.
Follow these steps if you want to find out if your computer is 32-bit or 64-bit.
Follow this step-by-step guide to learn how to design and create an object. Page 6.
Aggregation is a relationship between two objects that is best described as a
Find out what Java is, who created it, and why people choose to program with it.
Static methods are created using the static keyword.
An example program showing how to use the JTable class
Enhance the readability of your programs by using Java comments.
An example program showing how to implement the KeyListener interface.
Example Java program code for how to make simple message dialog boxes using the JOptionPane class.
Some classes are designed not to be extended by other classes. Find out how to prevent a class being inherited by another.
Learn how to use the JOptionPane class to make a simple message dialog box
Fields can be shared across all objects of the same type through the use of the static modifier.
A method signature is part of the method declaration. It is the combination of the method name and the parameter list.
Here you will find a list of words that you cannot use as identifiers in a Java program.
An identifier is simply a name given to a package, class, interface, method, or variable.
Make your first Java download the right one. Step-by-Step instructions on how to download the latest version of the JDK.
An example Java program showing how to use the JProgressBar
The ternary operator ?: earns its name because it's the only operator to take three operands.
In a method call the implicit parameter is the object the method belongs to.
Use the if-then and if-then-else statements when your program needs to make a simple decision about what to do next.
Follow this step-by-step tutorial to learn how to write, compile and run Java applets.
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.
Reached end of file while parsing is a compile time error.
The association relationship is a way of describing the fact that a class knows about, and holds a reference to another class.
There are three different types of exceptions a Java application might encounter.
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.
An example program to show the DefaultTableModel in action.
Bring a sense of order to your classes through the use of packages.
A look at the JTable class and how it can be used to make simple tables for GUIs
See if you can debug a piece of code that produces one of the most fundamental Java runtime errors.
Example Java program code for creating a simple password dialog box.
Example Java program code to make several different types of input dialog boxes using the showInputDialog method of JOptionPane.
How to convert Strings to numbers and back again.
Example code for reading and writing to a binary file one byte at a time.
Sometimes the random numbers to be picked need to be unique.
Learn about the Unicode standard, a global way to encode the characters that computers use.
Find out how to use the showInputDialog method of the JOptionPane class to make different kinds of input dialog boxes.
Scope refers to the lifetime and accessibility of a variable. How large the scope is depends on where a variable is declared.
The void keyword denotes that a method does not have a return type.
Declaration statements are used to declare variables.
Following on from the first article on generating random numbers in Java, find out how to generate random fractional numbers and boolean values.
A variable is a container that holds values that are used in a Java program.
A simple application showing how the CardLayout can be used to switch JPanels.
Learn how to include the functionality of packaged classes into your programs.
Learn about object inheritance and how it can be used to create a relationship between objects that share common characteristics.
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.
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 make use of command-line arguments in your Java applications.
How to make use of arrays. Java.
The Java language provides eight primitive data types that define simple values a program can use.
A superclass is a class that has been extended by another class.
Parameters are the variables that are listed as part of a method declaration.
An example Java program showing a simple application using the BoxLayout.
Conditional operators are used to evaluate a condition that's applied to one or two boolean expressions.
An object is an instance of a class.
Concatenation describes the operation of joining two strings together.
String Literals are used for representing string values in Java code.
A subclass is a class that extends another class.
When coding in Java it's important to remember that Java is case sensitive. Here are some tips to avoid common case sensitivity pitfalls.
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.
This example code shows how to simply switch between two JavaFX stylesheets.
Example Java code showing how the ListView and ComboBox JavaFX controls can be used.
An overview of how to use the GridPane to make a table format.
An overview of the BorderLayout layout manager.
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.
Things are a little different for Java developers on Mac OS X. Find out how Java fits in with Apple computers.
NetBeans is a sophisticated IDE that aims to help developers build any type of application.
Learn how to read bytes from a binary file one byte at a time.
How to use the ArrayList class. Java.
A Java program to show the String class in action.
An example program to show how to code a BorderLayout layout manager with assigned horizontal and vertical spacing.
Competition in the Robocode arena is fierce. Learn Java by trying to build a robot that will send all the others to the scrap heap!
The term composition takes on different meanings depending on the subject, and in Java it has its own meaning as well.
Java 7 Update 45 has been released and the JDK is available to download from Oracle's Java download page. The release notes show this to be a security fix
A look at how to use the GridLayout layout manager.
Compound assignment operators provide a shorter syntax to assign the results of the arithmetic and bitwise operators.
A constant is a variable whose value cannot change once it has been assigned.
How to create a simple JavaFX FXML application using NetBeans and Scene Builder.
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.
Example code showing how the GridBagLayout layout manager can be used to position components.
The ActionListener interface is an event listener for actions performed by some graphical components.
Find out about data encapsulation, the most important concept of object-oriented programming.
If expressions are akin to clauses in the English language, then statements are like sentences.
An overview of the Adopt a JSR program
Overloading is the ability to define more than one method with the same name in a class.
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.
An example of how to use the JavaFX BorderPane layout
Expressions are essential building blocks of any Java program. They are built using values, variables, operators and method calls.
Step-by-Step instructions on how to install the latest version of the JDK.
Turtles, magic and squares will conspire to test your logic in this exercise.
A look at the JavaFX ComboBox class.
Example Java code showing the ItemListener event listener in action
Use the switch statement when you want your program to chose between a number of alternative options.
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.
Building an interface for a simple calculator program
Java is a strongly typed programming language because every variable must be declared with a data type.
Arithmetic operators perform the same basic operations you would expect if you used them in mathematics (with the exception of the percentage sign).
Example Java code showing how the TreeView JavaFX control is used.
Can you rewrite this Java code so that there is no longer an infinite loop?
An event listener receives and process events.
How to delete, copy and move files using nio.2
The main method is the starting point for the execution of every Java application.
An event typically occurs when a user interacts with a user interface.
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.
Since Java 7 the version of Java for the Mac OS X now comes from Oracle.
A common question new developer are faced with, is where do I start when faced with learning the Java language? Here are some tips.
By using the JDialog class you can create custom dialog boxes that can be modeless.
Loops are a way of executing the same code block many times.
An example Java application which allows the user to combine various JOptionPane options to show example dialog boxes.
An example program showing how to implement the three mouse event listeners
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?
See how to create a message dialog box when you want the user to confirm a message with a Yes or OK.
Discover how a class can inherit the state and behaviors of another class.
A class specifies the design of an object.
java.lang.NoClassDefFoundError is a runtime error.
How to use the GridPane layout to place child nodes in a grid format.
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.
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.
Here are the steps to disable (or enable) the Java plugin in a browser.
Looking at the JavaFX program structure. Page 2.
A relational operator compares two operands to determine whether one is greater than, greater than or equal to, less than, less than or equal to the other.
The JColorChooser class is used to create a detailed color chooser dialog.
A GUI is the graphical interface presented to the user of an application.
Any application providing a secure environment for a user needs to be able to safely obtain the password for that user.
A look at the JavaFX ListView class
A look at the JavaFX ChoiceBox class
A look at the most common properties of the FlowLayout layout manager.
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.
A look at the JavaFX TextField class
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.
A Java compiler translates the Java code written by a programmer into instructions a computer can execute.
Example Java program code that shows the two static methods of the JColorChooser class in action to make a color chooser dialog box.
A look at the table model behind the JTable
Constructor chaining occurs through the use of inheritance.
Java handles exception through the use of the try-catch-finally blocks
Source code refers to the programming instructions used to create an application.
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.
A look at the JavaFX CheckBox class
How to use the Arrays class to manipulate Arrays