An examplet can have enough detail for you to use it, as is. Or you might have to get more information about the involved classes. A good place to find information about the Java 2 Platform APIs is the Java 2 Platform API index.

It's also good practice to add catch clauses, as appropriate, to the examplets. If the code of an examplet throws a checked exception, the code is surrounded by a try/catch statement. However, to reduce space and distraction, the catch clause is left blank. Catch clauses should always handle the exception and should never be left blank. So, at the very least, you should include a call to e.printStackTrace() to display the exception on the console.

You'll find examplets in a variety of categories. See the Table of Contents for a list of categories, and the examplets in each category.

Table of Contents

Accessibility Arrays Applets Application and System AWT (Abstract Windowing Toolkit) Clipboard Drag and Drop Events Fonts Shapes Compression JAR files Database - JDBC Data Structures and Algorithms Files, Streams, I/O Images Internationization JavaBeans TM JNDI Directory Event Ldap Math Networking Printing Reference Objects Reflection RMI Security Sound Sampled Midi Strings Swing Events File Chooser Layout Tree Text Threads Time javax.rmi javax.swing.undo

(javax.accessibility) (java.lang) (java.applet) (java.lang) (java.awt) (java.awt.datatransfer) (java.awt.dnd) (java.awt.event) (java.awt.font) (java.awt.geom) (java.util.zip) (java.util.jar) (java.sql) (java.util) (java.io) (java.awt.image) (java.text) (java.beans) (javax.naming) (javax.naming.directory) (javax.naming.event) (javax.naming.ldap) (java.math) (java.net) (java.awt.print) (java.lang.ref) (java.lang.reflect) (java.rmi) (java.security) (javax.sound.sampled) (javax.sound.midi) (java.lang) (javax.swing) (javax.swing.event) (javax.swing.filechooser) (java.awt and javax.swing) (javax.swing.tree) (javax.swing.text) (java.lang) (java.lang) (javax.naming) (javax.naming.directory) (javax.naming.event) (javax.naming.ldap) (javax.rmi) (javax.swing.undo)

Accessibility (javax.accessibility)
	The Quintessential Accessible Object Setting an Accessible Name for an Image Button Setting a Description for Image Icons Setting a Mnemomic for Buttons Setting a Mnemonic for a Menu Associating a Label with a Component Setting a Keyboard Accelerator for a Menu Item
Applets (java.applet)
	The Quintessential Applet Getting an Applet Parameter Making the Browser Visit a URL Showing a Message in the Browser's Status Bar Loading and Playing Audio in an Applet Loading and Playing Audio in an Application Loading and Painting an Image in an Applet Animating an Array of Images in an Applet
AWT (Abstract Windowing Toolkit) (java.awt)
	The Quintessential Drawing Program Drawing Basic Shapes Filling Basic Shapes Loading an Image Drawing an Image Scaling, Shearing, Translating, and Rotating a Drawn Image Drawing Simple Text Drawing Rotated Text Getting the Dimensions of Text Drawing Anti-Aliased Text and Graphics Drawing with Alpha Setting the Clipping Area with a Shape Changing the Thickness of the Stroking Pen Creating a Shape from a Stroked Shape Stroking or Filling a Shape Stroking or Filling with a Color Stroking or Filling with a Gradient Color Stroking or Filling with a Texture Animating an Array of Images in an Application Setting a Component's Cursor
	Clipboard (java.awt.datatransfer)
		Retrieving Text from the System Clipboard Placing Text on the System Clipboard
	Drag and Drop (java.awt.dnd)
		Making a Component Draggable Making a Component a Drop Target Handling a Drop Event
	Events (java.awt.event)
		Handling Events with an Anonymous Class Handling Action Events Handling Key Presses Handling Mouse Clicks Handling Mouse Motion Detecting Double and Triple Clicks Handling Focus Changes
	Fonts (java.awt.font)
		Listing All Available Fonts Drawing a Paragraph of Text Getting the Shape from the Outline of Text Drawing Text with Mixed Styles
	Shapes (java.awt.geom)
		Creating a Shape with Lines and Curves Creating Basic Shapes Combining Shapes Scaling, Shearing, Translating, and Rotating a Shape
Compression (java.util.zip)
	Compressing a File Decompressing a File Listing the Contents of a ZIP File Calculating the Checksum of a Byte Array
	JAR files (java.util.jar)
		Retrieving the Manifest of a JAR File
Database - JDBC (java.sql)
	Connecting to a Database Creating a Database Table Entering a New Row into a Database Table Getting All Rows from a Database Table Getting Particular Rows from a Database Table Updating a Row of Data in a Database Table Using a Prepared SQL Statement
Data Structures and Algorithms (java.util)
	Creating a Set Creating a List Creating a Hash Table Truncating a List Converting a Collection to an Array Converting an Array to a Collection Implementing a Queue Implementing a Stack Iterating the Elements of a Collection Sorting an Array Finding an Element in a Sorted Array Finding an Element in a Sorted List Inserting an Element into a Sorted List Generating a Random Number Breaking a String into Words Reading Properties from a Properties File Creating Date Object From a Particular Date Parsing a Date Using a Pattern Reading and Writing a Properties File Getting and Setting Properties Scheduling a Timer Task to Run at a Certain Time Scheduling a Timer Task to Run Repeatedly
Files, Streams, I/O (java.io)
	Constructing a Path Reading Text from Standard Input Reading Text from a File Writing to a File Creating a Directory Appending to a File Deleting a File Deleting a Directory Creating a Temporary File Using a Random Access File Listing the File System Roots Setting File Modification Time Serializing an Object Deserializing an Object Traversing a Directory Reading UTF-8 Encoded Data Writing UTF-8 Encoded Data Reading ISO Latin-1 Encoded Data Writing ISO Latin-1 Encoded Data
Images (java.awt.image)
	Converting an Image to a Buffered Image Getting Pixels from a Buffered Image Getting a Sub-Image of an Image Creating and Drawing on a Buffered Image Scaling, Shearing, Translating, and Rotating an Image Converting a Color Image to Gray Blurring an Image Sharpening an Image Embossing an Image
Internationization (java.text)
	Formatting and Parsing a Locale-specific Number Formatting and Parsing Locale-specific Currency Formatting and Parsing a Locale-specific Percentage Formatting and Parsing a Locale-specific Date Formatting and Parsing Locale-specific Time Formatting and Parsing a Locale-specific Date and Time Determining the Type of a Character Comparing Strings in a Locale-independent Way Determining the Character Boundaries in a Unicode String Determining the Word Boundaries in a Unicode String Determining the Sentence Boundaries in a Unicode String Determining Potential Line Breaks in a Unicode String
JavaBeans TM (java.beans)
	The Quintessential Bean Implementing a Bound Property Implementing a Constrained Property Instantiating a Bean Handling a Property Change Event Handling a Vetoable Property Change Event
Math (java.math)
	Operating With Big Integer Values Operating With Big Decimal Values Setting the Decimal Place of a Big Decimal Value
Networking (java.net)
	Creating a URL Parsing a URL Reading Text from a URL Calling a CGI Using POST Method Resolving a Hostname Creating a Client Socket Creating a Server Socket Reading Text from a Socket Writing Text to a Socket Sending a Datagram Receiving a Datagram Joining a Multicast Group Receiving from a Multicast Group Sending to a Multicast Group
Printing (java.awt.print)
	The Quintessential Printing Program Getting the Dimensions of a Printed Page Setting the Orientation of a Printed Page Printing Pages with Different Formats Displaying the Page Format Dialog Displaying the Print Dialog
Reference Objects (java.lang.ref)
	Holding onto an Object Until Memory Becomes Low Determining When an Object Is No Longer Used Determining When an Object Is About to be Reclaimed
Reflection (java.lang.reflect)
	Getting a Class Object Getting the Modifiers of a Class Object Getting the Interfaces of a Class Object Getting the Methods of a Class Object Getting a Constructor of a Class Object Creating an Object Using a Constructor Object Getting the Field Objects of a Class Object Getting and Setting the Value of a Field Invoking a Method Using a Method Object Getting the Modifiers of a Member Object Getting the Name of a Class or Member Object Determining if an Object Is an Array Determining the Dimensions of an Array Getting the Component Type of an Array Creating an Array Expanding an Array Getting and Setting the Value of an Element in an Array Overriding Default Access Creating a Proxy Object
RMI (java.rmi)
	Starting Up the RMI Registry Defining and Exporting a Remote Object Looking Up a Remote Object and Invoking a Method Passing Parameters to a Remote Method Returning Values from a Remote Method Throwing an Exception from a Remote Method
Sound
	Sampled (javax.sound.sampled)
		Loading and Playing Sampled Audio Determining the File Format of a Sampled Audio File Determining the Encoding of a Sampled Audio File Determining the Duration of a Sampled Audio File Playing Streaming Sampled Audio Continuously Playing a Sampled Audio File Determining the Position of a Sampled Audio Player Determining When a Sampled Audio Player has Finished Playing Controlling the Volume of Playing Sampled Audio
	Midi
		Loading and Playing Midi Audio Determining the File Format of a MIdi Audio File Determining the Duration of a Midi Audio File Playing Streaming Midi Audio Determining the Position of a Midi Sequencer Determining When a Midi Audio Player has Finished Playing Controlling the Volume of Playing Midi Audio
Security (java.security)
	Creating a New Key Pair and Self-signed Certificate Creating and Signing a JAR File Creating a New Policy File Managing Policy Files Creating a Keyed Digest Using MD5 Getting a Certificate from a Keystore Checking Read/Write Permission for a Directory Checking if One Permission Implies Another Creating a Secure Random Number
Swing (javax.swing)
	The Quintessential Swing User Interface Centering a Frame on the Screen Exiting an Application When a Frame Is Closed Creating a Button Creating a Checkbox Button Creating a Color Chooser Dialog Creating a ComboBox Creating Image Radio Buttons Retrieving the Selected Button in a Group Firing Item Events Creating a File Chooser Dialog Displaying Only Directories in a File Chooser Dialog Creating an Internal Frame Creating a List Component Creating a Scrolling List Component Setting the Selection Mode of a List Component Creating a Menu Bar, Menu, and Menu Item Separating Menu Items in a Menu Creating a Popup Menu Creating a Progess Bar Creating Radio Buttons Creating a Scroll Pane Creating a Slider Creating a Split Pane Creating a Tabbed Pane Creating a Text Field Creating a Password Text Field Creating a Table Creating a Text Area Displaying Simple HTML Files Creating a Toolbar Creating a Borderless Window Showing a Dialog Box Creating Key Strokes and Binding Them to Actions Adding an InputMap to a Component Setting a Tool Tip Laying Out Components in a Row or Column Separating Components in a Row or Column Laying Out Components in a Flow (Left-to-Right, Top-to-Bottom) Laying Out Components in a Grid Laying Out Components Using Absolute Coordinates Setting a Border Adding a Title to a Border Creating a Compound Border Determining the Available Look and Feels Setting the Look and Feel Painting the Background of a Container with an Image Pattern
	Events (javax.swing.event)
		Handling Hyperlink Events Handling Changes to a List Component
	File Chooser (javax.swing.filechooser)
		Adding a Filter to a File Chooser Dialog
	Tree (javax.swing.tree)
		Creating a Tree Handling Selection Events in a Tree Component
	Text (javax.swing.text)
		Inserting Styled Text in a Text Pane Inserting an Image into a Text Pane Inserting a Component into a Text Pane
java.lang
	The Quintessential Java Application Exiting a Java Program The Quintessential Thread Making an Object Cloneable Constructing a String Getting a Substring from a String Searching a String Replacing Characters in a String Replacing Substrings in a String Converting a String to Upper or Lower Case Converting a String to a Number Shifting Elements in an Array Copying Elements from One Array to Another Retrieving the SuperClass of an Object Getting the Package of an Object Implementing a Work Queue Executes a Command Reading Output from a Command Sending Input to a Command Pausing Getting the Current Time Getting the Value of a System Property Setting the Value of a System Property Using a Thread-local Variable Loading Native Code Converting Unicode to UTF-8 Converting UTF-8 to Unicode Determining a Character's Unicode Block
JNDI
	Creating an Initial Context to the Naming Service Looking Up an Object From the Naming Service Listing a Context in the Naming Service Adding, Replacing, Removing, and Renaming a Binding in the Naming Service Creating and Destroying a Subcontext in the Naming Service Getting an Object's Fully Qualified Name Using a URL as a Name to the Initial Context Parsing a Composite Name Parsing a Compound Name
	Directory (javax.naming.directory)
		Creating an Initial Context to a Directory Reading an Object's Attributes from the Directory Modifying an Object's Attributes in the Directory Creating an Directory Entry Adding a Binding with Attributes to the Directory Performing a Basic Directory Search Searching the Directory By Using a Search Filter Searching a Subtree in the Directory Cancelling a Directory Search Getting an Object's Schema from the Directory Getting an Attribute's Schema from the Directory Authenticating to the Directory
	Event (javax.naming.event)
		Registering for Namespace Changes in the Directory Registering for Object Changes in the Directory
	Ldap (javax.naming.ldap)
		Setting LDAP Connection Request Controls Setting LDAP Context Request Controls Getting LDAP Response Controls Performing an LDAP ``Extended'' Operation
javax.rmi
	Starting the Name Server Defining and Exporting a Portable Remote Object Looking Up a Portable Remote Object and Invoking a Method
javax.swing.undo
	Adding Undo and Redo to a Text Component