Introduction to java applets

Java Applets And Its Uses

What is an applet in java, and what are its uses?

An applet is a software component that enables client-side programming and facilitates text, graphics, audio, imaging, animation and networking, besides live updating and securing two way interaction in web pages.One of the main features of java is the applet.These are usually small in size.Applets are used to embed the code in a web browser and to generate the dynamic contents and its works on the client side.Its response time is very fast.

The main features of applets are following:

It provides a GUI
Facilitates graphics,animation and multimedia.
Provides a facility for frames.
Enable event handling.
Avoid a risk and provides a secure two-way interaction between web pages.

Applet Life cycle:

Java applets have a specific programming structure and a specific life cycle that describes how it starts, how it runs, and how it ends.

The life cycle consists of five methods: These methods are used as follows:
init() —> It is called only once when the applet is first loaded and created by the browser.
start() —> It runs whenever the applet becomes visible.
paint(Graphics g) —> Display the content on the applet.
stop() —> It is called when the becomes invisible.
destroy() —> It is called when the applet is shutdown.
Every applet program starts execution from init().Here not writing the main method.
init() ,start() ,stop() ,destroy() These four methods are available in java awt applet class and paint() method java awt component class.
What is AWT in java?
The AWT is a java framework has a set of Java classes that provide the standard user-interface elements(windows,menus,boxes,buttons,lists and so on).That is,AWT provides several facilities for drawing two-dimensional shapes,controlling color and font.The java foundation class (JFC) provides two frameworks for building graphical user interface(GUI) based applications.
1 AWT (Abstract Window Toolkit)-The class hierarchy of AWT
2 Swing

Implementation of java applets are done in two ways.

1 By using an HTML file.The main drawback of using HTML files is that the browser should have a Java plugin installed.

2 By using the appletviewer tool.

What is HTML?

Hyper Text Markup Language.Which is used to create the web pages.

Applet Hierarchy In Java

Comments

Introduction to java programming-very important theory notes

Introduction to java programming what is java? Java is a high level object oriented computer programming language(OOPS). Java is a general purpose programming language used in computers and other applications. Java, an object-oriented programming language developed by Sun Microsystems under the leadership of James Gosling, Bill Joy, etc., is used today in many electronic devices such as web servers, computers, and mobile phones. Although it is mostly used for web programming, it is a multi-purpose programming language that can be used to do many other things. After Oracle bought Sun Microsystems in mid-2009, Java came under Oracle's control. (Wikipedia). What is a computer? A computer is an electronic device for storing and processing huge amounts of information. What is a computer program? A computer program is a set of instructions for a computer to perform a specific task. A computer cannot do anything by itself, if it wants to do something, it must get clear instructions, the i...

JAVA BUZZWORDS

JAVA BUZZWORDS & H istory of the development of java java buzzwords explanation Features of java is called as Java Buzzwords Platform independent —> Run on any Environment Object oriented concept(oops) —> Abstraction,Encapsulation,Inheritance and polymorphism Simple —> No concept of pointers,explicit memory allocation, structures,operator overloading etc Secure —> Secure for internet application (Raise out of boundary exception in arrays and it is strong typed language) Robust —> Early checking of error it can achieved garbage collector, exception handling Portable —> Java program written on one environment can be executed or implemented another environment Multithreading —> Concurrent execution of several parts of same program at same time(This will improve CPU utilization) Distributed Application —> This are software that runs on multiple computers connected to a network at ...

How to run java program using while loop

Java program how to print Happy New Year in 10 times(using while loop) java buzzwords static keyword in java The AI Revolution- Malayalam article step by step explanation Before writing Java code Install Jdk on your system and Set the path properly. Then type the Java code in the notepad and save it as a class name with the .java extension. Select the file type 'all file' while saving. Open cmd, Change the directory where the file is saved, using the cd command. Type javac class name.java then press the enter key, If you type java and give the class name, If there is no error in the program, the output will be generated. Observe the directory change using the cd command. Give the class name and watch it compile and run. How to run java program in notepad and cmd Where to code in Java and how it works? method 1 A text editor is required to write Java code The code can be run using the command prompt method 2 using an integrated development environment (IDE), such as Eclips...

Oops concepts in java

oops concepts in java with example programs Oops concepts in java Oops concept is very very important to make java programming easier and increase your programming skill.Four pillars of oops are Abstraction,Encapsulation,Inheritance,Polymorphism.Another technique to carefully understand in Java is classes and objects. This article covers very simple notes for Java programming beginners. What is object and class? The basics of oops is class and object Class is a blueprint which defines some properties and behaviors. An object is an instance of a class which has those properties and behaviors attached.A class is not allocated memory when it is defined. An object is allocated memory when it is created Class and object —> object is defined as real word entities .Object consists of property and some task Class is a blueprint that object follows, Class consists of many number of objects Four pillars of oops are Abstraction —> Means showing only essential parts and hi...

Command Line Arguments In Java

Command Line Arguments In Java No input statement needed in the program itself. we can pass the input as an argument while running the program. Sometimes you will want to pass information into a program when you run it. This is accomplished by passing command line arguments to main function. To access the command line arguments inside a java program is quite easy are stored as string in string array passed to main function. Example program of command line arguments in java class CommandLineExample { public static void main(String args[]) { System.out.println("\nMy first input is :"+args[0]); } } Addition of two numbers in java using command line arguments Example:write a program add two integer number class AddCommandLine { public static void main(String args[]) { int num1=Integer.parseInt(args[0]); //type cast int num2=Integer.parseInt(args[1]); //type ...

Keywords in java programming

Keywords in java programming Keyword is a predefined word given by the compiler which has some specific task. Keywords also known as reserved word. All the java technology keywords are lower case . Java programming has a richer set of keywords than C language or C ++ language. Some java keywords are import —>In java programming implementing classes and methods import the packages that purpose using the keyword import. class —> In order to create a class we have use the keyword class to see an example written using the class keyword ) this —> This keyword is used to represent the method belongs to particular current object Super —> It can used in inheritance concept extends —> Also used in inheritance concepts. Accessing methods one class to another class that can done by extends keyword package —> In java there will be package which consists of number of classes and interfaces in order to access that package, using the key word package return —> Return key wor...

Naming Convention In Java

Naming Convention In Java-camel case example Naming Conventions are rules to be followed by giving a name to the identifier.Identifiers are program elements(such as class,object,variable,method so on ).For building software you should follow this rule to make your code look good, more efficient and more readble.Java has certain rules for naming identifier. This are given below Digit, letters, underscore or currency symbols( £, €, $ ) are allowed The first letter of any identifier cannot be a digit An identifier name must not be a reserved words or keywords Java follows camelCase rule what is camelcase rule? CamelCase is a way to separate the words in a phrase by making the first letter of each word capitalized and not using spaces (ex :- MyFirstJavaClass) Class name —> should begin with a capital letter(In a single word) If it is multiple words, the first letter of every word begins with a capital letter. Ex :- class Stu...

بسم الله الرحمن الرحيم

Free Java Fundamentals Theory Notes For Beginners

Search This Blog