What is a java applet?
I have been learning java programming for the past three months and I am almost through but there is something I just dont get.What is a java applet?? I see it a lot of times on articles on the web.I know what a java program is, but this applet thing I just dont get.What is the difference between a normal java program and a java applet? Is a java applet created using another programming language or something? Please help.
How do I download the entire java applet for offline use?
I am attempting to download this applet here: http://users.smogon.com/X-Act/defense.html I successfully downloaded the class file through viewing the page source, however it doesn't contain all the necessary methods to run it offline, probably due to the applet downloading packages after it's run in the browser. If there's any way I could download the entire applet? Any help is much appreciated.
I need help with drawing 3D molecules such as CH3CH2CO2H. Can you please descibe how to draw it.?
You have in your hands (literally) one of the simplest tools for visualizing molecules in 3-D. This is one of the first things I teach beginners: make a V or 'peace' sign with your index and middle fingers, then stick out your thumb as well. These three digits represent three of the four apex points of a tetrahedron. The fourth apex is your wrist. Now where your fingers and thumb come together would be the central carbon atom of the 3-D centre you are thinking about. For your example, CH3CH2COOH, that would be the -CH2- carbon atom. If you think of or even mark each of those four points one your hand as being -CH3, -H, -H, and -COOH, and hold your hand as described above you will immediately see the 3-D structure of the molecule. To take this a step further, let's change one of the H's on -CH2- to an OH group to make the molecule asymmetric, as CH3CH(OH)COOH. Now, if you mark the four groups -CH3, -H, -OH, and -COOH on one hand, and then mark the other hand exactly the same way you will have in hand (!) the mirror image configurations of the two enantiomeric forms of the molecule. You will also be able to see how it is impossible to match up all four substituents in the two enantiomeric forms to have the same arrangement around the central C atom. Note that if any two of the substituents are the same (as in CH3CH2COOH) this will not be true and you will be able to match up all four substituents to each other. Try this a couple of times. Just by the way, it is a perfect 'cheat' on exams because there is no way you can be prevented from taking this aid into the exam with you short of a double amputation...
What is a Java Applet?
An applet is a small Internet-based program written in Java, a programming language for the Web, which can be downloaded by any computer. The applet is also able to run in HTML. The applet is usually embedded in an HTML page on a Web site and can be executed from within a browser.An applet is a Java program that runs in a Web browser. An applet can be a fully functional Java application because it has the entire Java API at its disposal.There are some important differences between an applet and a standalone Java application, including the following −An applet is a Java class that extends the java.applet.Applet class.A main() method is not invoked on an applet, and an applet class will not define main().Applets are designed to be embedded within an HTML page.When a user views an HTML page that contains an applet, the code for the applet is downloaded to the user's machine.A JVM is required to view an applet. The JVM can be either a plug-in of the Web browser or a separate runtime environment.Besant Technologies holds out top quality Java Training in Chennai with an exceptionally skillful combination of talented instructors, distinguished and easy–read training materials, and a remarkable learning environment that clearly shelve our Java training phase in the top Training’s rack. We offers a wide range of JAVA training in Chennai to meet the growing corporate needs.
Why won't Java Applets run in my web browser?
Java applets are small programs that are typically designed to run in a Web browser. Common applets include math programs, 3D model viewers, and various types of games. Since these programs are written in Java, they require a Java compiler, or Java Virtual Machine (JVM) to run.Most computer systems today come with Java pre-installed, which includes support for Java applets. However, some applets may contain code that requires an updated version of Java. This means they won't run on computers with older Java installations. Also, if Java is not installed correctly, some Web browsers may not recognize Java applets.The remedy for both of these problems is to install the latest version of Java. Fortunately, Java is available as a free download. Windows and Linux users can get the latest version of Java at Sun Microsystems' Java Downloads page. Since Java is installed as part of Mac OS X, Mac users can update their Java installation using the Mac OS X "Software Update" feature.After installing the latest version of Java, you may be asked to restart your computer. Once your computer restarts, open your Web browser and try loading the Java applet that wouldn't open before. It should be recognized by your browser and will run using the newly installed Java Virtual Machine.
Why can we use applets in Java?
Applet is a special type of program that is embedded in the webpage to generate the dynamic content. It runs inside the browser and works at client side. There are many advantages of applet. They are as follows:It works at client side so less response time.SecuredIt can be executed by browsers running under many plateforms, including Linux, Windows, Mac Os etc.Plugin is required at client browser to execute applet.Applets are designed to be embedded within an HTML page. When a user views an HTML page that contains an applet, the code for the applet is downloaded to the user's machine. A JVM is required to view an applet. The JVM can be either a plug-in of the Web browser or a separate runtime environment.
What is the applet life cycle in Java?
An applet is a special kind of Java program that is designed to be transmitted over the Internet and automatically executed by a Java-compatible web browser. Applets are intended to be small programs and can be downloaded on demand. They are typically used to display data provided by the server, handle user input, or provide simple functions, such as a loan calculator, that execute locally, rather than on the server.An Applet is a subclass of java.applet.Applet package. It doesn’t consist of a main method unlike a Java application.Different states that an applet experiences between its object creation and object removal is known as Applet Life Cycle. There exists 5 states represented by 5 methods.These methods are known as "callback methods" as they are called automatically by the browser whenever required for the smooth execution of the applet.Description of Life Cycle MethodsFollowing is the brief description of the Life Cycle methods.public void init(): This method is called at the time of starting the execution. This is called only once in the life cycle. This method initializes the Applet and it helps to initialize variables and instantiate the objects and load the GUI of the applet. This is invoked when the page containing the applet is loaded. It is the born state of a thread.public void start(): Even though applet object is created by the init() method, it remains in inactive state. The init() method calls start() method. It starts the execution of Applet. In this state, the applet becomes active.public void stop(): In this method the applet becomes temporarily inactive. It is invoked when the Applet stops or when the browser is minimized. The Applet frequently comes to this state in its life cycle and can go back to its active state. It is equivalent to the blocked state of the thread.public void paint() : This method takes a java.awt.Graphics object as parameter. This method helps to create Applet’s GUI such as a colored background, drawing and writing. paint() method is called by the start() method. This is called number of times in the execution.This is equivalent to runnable state of thread.public void destroy(): This destroys the Applet and is also invoked only once when the active browser page containing the applet is closed. It is equivalent to the dead state of the thread.The init() and destroy() methods are called only once in the life cycle. But, start(), paint() and stop() methods are called a number of times.
What is the basic purpose of Applet and how can we use it on a website?
A Java applet is a small application which is written in Java and delivered to users in the form of bytecode. The user launches the Java applet from a web page, and the applet is then executed within a Java Virtual Machine (JVM) in a process separate from the web browseritself. A Java applet can appear in a frame of the web page, a new application window, Sun's AppletViewer, or a stand-alone tool for testing applets. Java applets were introduced in the first version of the Java language, which was released in 1995.The following example illustrates the use of Java applets through the java.applet package. The example also uses classes from the JavaAbstract Window Toolkit (AWT) to produce the message "Hello, world!" as output.[code]import java.applet.Applet;import java.awt.*; // Applet code for the "Hello, world!" example.// This should be saved in a file named as "HelloWorld.java".public class HelloWorld extends Applet { // Print a message on the screen (x=20, y=10). public void paint(Graphics g) { g.drawString("Hello, world!", 20, 10); // Draws a circle on the screen x=40, y=30). g.drawArc(40, 30, 20, 20, 0, 360); }}[/code]Simple applets are shared freely on the Internet for customizing applications that support plugins.[27]After compilation, the resulting .class file can be placed on a web server and invoked within an HTML page by using an