Applets
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An applet is a special type of program embedded in a webpage to generate dynamic content. It runs inside the browser at the client side. Advantages of applets include less response time since they run on the client side and can run on multiple platforms. The lifecycle of a Java applet includes initialization, start, paint, stop, and destruction. The Applet class provides lifecycle methods like init(), start(), stop(), and destroy(). To create an applet, the Applet class must be extended and its lifecycle methods can be overridden.
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Applet
An applet is a Java program that runs in a web browser. It is embedded in a web page and generates dynamic content on the client-side. Applets have several advantages, including faster response times and cross-platform compatibility. The lifecycle of an applet includes initialization, start, paint, stop, and destruction methods. To create an applet, developers inherit from the Applet class and implement its lifecycle methods. Applets can be run from an HTML file or using the appletviewer tool for testing purposes.
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An applet is a small Java program that can be embedded into a web page and runs within a web browser at the client side. Applets are used to make websites more dynamic and entertaining. The life cycle of an applet involves init(), start(), paint(), stop(), and destroy() methods being called in that order when an applet begins and ends. There are two main GUI packages that support applets: AWT and Swing.
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Applets are Java programs that can be embedded in HTML pages and run in web browsers. An applet's lifecycle involves several method calls: init() is called once to initialize variables; start() restarts the applet after being stopped or loads it initially; paint() redraws the applet's output; stop() suspends threads when the applet is no longer visible; and destroy() removes the applet from memory, freeing resources. Applets allow making websites more dynamic but require the Java plugin and have security restrictions compared to standalone applications.
Applets
This document discusses Java applets, which are small programs that run within web browsers. It defines applets and compares them to applications. The document outlines the life cycle of an applet, including initialization, running, stopping, and cleanup. It also discusses signed versus unsigned applets and security restrictions placed on applets. Examples of applets are provided. Advantages of applets include cross-platform support and caching, while disadvantages include requiring the Java plugin and initial startup time.
Java applet
An applet is a Java program that runs in a web browser. Applets extend the Applet class and have a lifecycle of init(), start(), stop(), and destroy() methods. Applets are embedded in HTML pages and have security restrictions enforced by the browser. When a user views an HTML page containing an applet, the applet code is downloaded and a JVM instance is created to run the applet.
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The document discusses applet classes, methods, and architecture. It explains that applet is a subclass of Panel and Component classes, and provides methods for running applets. The document also describes how applets are event-driven programs that wait for and respond to user interactions like mouse clicks or key presses by calling event handlers.
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This document discusses Java applets, including their hierarchy as a type of component, their life cycle of being born, running, stopped, and destroyed, and their merits of being able to be embedded in web pages but also their limitations of strict security compared to standalone applications. It also briefly mentions the introduction, comparison to applications, and conclusion regarding applets.
Java applets
Java applets are small Java programs that can be embedded within HTML pages. When a user views a page containing an applet, the applet code is transferred to their system and executed by the Java Virtual Machine within their browser. Applets allow for interactive features on web pages like capturing mouse input and including buttons or checkboxes. They can also play media formats not natively supported by browsers. Applets are embedded using the applet or object tags, which can specify the applet's location and download any necessary Java plugins.
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Applet
An applet is a Java program that runs in a web browser. It is embedded in a web page and generates dynamic content on the client-side. Applets have several advantages, including faster response times and cross-platform compatibility. The lifecycle of an applet includes initialization, start, paint, stop, and destruction methods. To create an applet, developers inherit from the Applet class and implement its lifecycle methods. Applets can be run from an HTML file or using the appletviewer tool for testing purposes.
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An applet is a small Java program that can be embedded into a web page and runs within a web browser at the client side. Applets are used to make websites more dynamic and entertaining. The life cycle of an applet involves init(), start(), paint(), stop(), and destroy() methods being called in that order when an applet begins and ends. There are two main GUI packages that support applets: AWT and Swing.
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Applets are Java programs that can be embedded in HTML pages and run in web browsers. An applet's lifecycle involves several method calls: init() is called once to initialize variables; start() restarts the applet after being stopped or loads it initially; paint() redraws the applet's output; stop() suspends threads when the applet is no longer visible; and destroy() removes the applet from memory, freeing resources. Applets allow making websites more dynamic but require the Java plugin and have security restrictions compared to standalone applications.
Applets
This document discusses Java applets, which are small programs that run within web browsers. It defines applets and compares them to applications. The document outlines the life cycle of an applet, including initialization, running, stopping, and cleanup. It also discusses signed versus unsigned applets and security restrictions placed on applets. Examples of applets are provided. Advantages of applets include cross-platform support and caching, while disadvantages include requiring the Java plugin and initial startup time.
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An applet is a Java program that runs in a web browser. Applets extend the Applet class and have a lifecycle of init(), start(), stop(), and destroy() methods. Applets are embedded in HTML pages and have security restrictions enforced by the browser. When a user views an HTML page containing an applet, the applet code is downloaded and a JVM instance is created to run the applet.
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The document discusses applet classes, methods, and architecture. It explains that applet is a subclass of Panel and Component classes, and provides methods for running applets. The document also describes how applets are event-driven programs that wait for and respond to user interactions like mouse clicks or key presses by calling event handlers.
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This document discusses Java applets, including their hierarchy as a type of component, their life cycle of being born, running, stopped, and destroyed, and their merits of being able to be embedded in web pages but also their limitations of strict security compared to standalone applications. It also briefly mentions the introduction, comparison to applications, and conclusion regarding applets.
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Java applets are small Java programs that can be embedded within HTML pages. When a user views a page containing an applet, the applet code is transferred to their system and executed by the Java Virtual Machine within their browser. Applets allow for interactive features on web pages like capturing mouse input and including buttons or checkboxes. They can also play media formats not natively supported by browsers. Applets are embedded using the applet or object tags, which can specify the applet's location and download any necessary Java plugins.
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Applets are Java programs that run in web browsers. They are embedded in web pages and run on the client side. When an applet starts, the init(), start(), and paint() methods are called sequentially. When it terminates, the stop() and destroy() methods are called. Applets do not use a main method but are instead automatically called. They allow moving work from the server to the client and are cross-platform, but require the Java plugin and may not run on all browsers.
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- A Java applet is a small Java application delivered as bytecode and run within a Java Virtual Machine in the user's web browser.
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- The document discusses the lifecycle methods of applets like init(), start(), stop(), and destroy(), and provides simple code examples of basic "Hello World" applets.
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This document discusses the basics of Java applets. It explains that applets are small Java programs used in web pages that are automatically downloaded and run in a web browser. Applets interact with the user through AWT instead of console I/O. Applets can be local or remote, with remote applets requiring an internet connection to download from a server. The document contrasts applets and applications, noting that applets do not use main() and cannot access local files or programs.
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This document discusses Java applets. It introduces applets as simple Java programs that can run in web browsers. It then describes the class hierarchy for applets, providing an example "Hello World" applet code. The document concludes by explaining how to create an HTML page that embeds the applet so it can be viewed using appletviewer from the command line.
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The document discusses applet initialization and termination. When an applet begins, the methods init(), start(), and paint() are called in that order. When an applet terminates, the methods stop() and destroy() are called, with stop() always being called before destroy(). The init() method initializes variables and is only called once, while start() resumes execution when the user returns to the page and paint() repairs damage when the applet regains focus.
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This document discusses Java applets, including their life cycle, differences from Swing, and advantages/disadvantages. Applets run in a web browser and have an initialization state, running state, idle/stopped state, and dead state. They do not use a main method but instead override init(), start(), paint(), stop(), and destroy() methods. Compared to Swing, applets are heavier weight, use AWT layouts, and require a browser to run. Advantages include cross-platform capability and moving work to the client, while disadvantages are needing the Java plugin and some browsers not supporting applets.
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This document provides an overview of Java applets, including:
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- There are two types of applets - AWT applets which use older GUI classes, and Swing applets which use newer GUI classes.
- The Applet class provides lifecycle methods like init(), start(), stop(), and destroy() that are called at different points in the applet's execution. It also includes painting and display methods like paint(), repaint(), and drawString().
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This document provides an overview of Java applets, including:
- An applet is a Java program that runs in a web browser and has full access to the Java API.
- The main differences from a standalone application are that an applet extends Applet, does not define a main method, and is designed to run embedded in an HTML page.
- When a user views an HTML page containing an applet, the applet code is downloaded and a JVM instance is created to run the applet.
- "Hello World" is a simple example applet that draws a string to the screen in its paint method.
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This document provides an overview of applet programming in Java. It discusses that applets are small Java programs that are embedded in web pages and can be transported over the Internet. The document then covers the differences between applets and standalone Java applications, the lifecycle of an applet including common methods like init(), start(), stop(), and destroy(), and provides a simple example for creating an applet program by writing the Java code, embedding it in an HTML file, and running it in a web browser or with the appletviewer tool.
Applet
An applet is a Java program that runs in a web browser. It extends the Applet class and can be embedded in an HTML page. Applets have advantages like less response time since they run on the client side, and can be platform independent. They require the Java plugin. The lifecycle of an applet involves init(), start(), stop(), and destroy() methods. Applets can be executed by HTML files or the appletviewer tool.
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This document discusses applets in Java. It defines applets as client-side Java programs that run in web browsers. The document outlines the advantages of applets, describes the lifecycle of applets, and provides examples of how to design, write, and run applet programs using HTML tags and the appletviewer tool. It also briefly introduces factory methods in Java.
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- A Java applet is a small Java application delivered as bytecode and run within a Java Virtual Machine in the user's web browser.
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This document discusses Java applets, including their life cycle, differences from Swing, and advantages/disadvantages. Applets run in a web browser and have an initialization state, running state, idle/stopped state, and dead state. They do not use a main method but instead override init(), start(), paint(), stop(), and destroy() methods. Compared to Swing, applets are heavier weight, use AWT layouts, and require a browser to run. Advantages include cross-platform capability and moving work to the client, while disadvantages are needing the Java plugin and some browsers not supporting applets.
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- The Applet class provides lifecycle methods like init(), start(), stop(), and destroy() that are called at different points in the applet's execution. It also includes painting and display methods like paint(), repaint(), and drawString().
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This document provides an overview of applet programming in Java. It discusses the basics of applets including the applet lifecycle, differences between applications and applets, parameter passing in applets, and event handling using listeners. It also covers input/output in applets, using repaint(), getDocumentBase(), and getCodeBase() methods. The document explains layout managers and creating buttons and text fields. It provides an example of a simple "Hello World" applet and discusses running applets in a browser or applet viewer.
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This document provides an overview of Java applets, including:
- An applet is a Java program that runs in a web browser and has full access to the Java API.
- The main differences from a standalone application are that an applet extends Applet, does not define a main method, and is designed to run embedded in an HTML page.
- When a user views an HTML page containing an applet, the applet code is downloaded and a JVM instance is created to run the applet.
- "Hello World" is a simple example applet that draws a string to the screen in its paint method.
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This document provides an overview of applet programming in Java. It discusses that applets are small Java programs that are embedded in web pages and can be transported over the Internet. The document then covers the differences between applets and standalone Java applications, the lifecycle of an applet including common methods like init(), start(), stop(), and destroy(), and provides a simple example for creating an applet program by writing the Java code, embedding it in an HTML file, and running it in a web browser or with the appletviewer tool.
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This document contains a quiz on Java servlets. It includes 14 multiple choice questions about servlets, JDBC drivers, JSPs, and session tracking. The questions cover topics such as the Java specification that defines the API for communication between a web server and application, extracting parameter values from an HTTP request, the four types of JDBC drivers defined by Sun, which driver types can be used in applets or servlets, how a JSP is transformed, redirecting an HTTP response, communicating from an applet to a servlet, maintaining client state at the server side with sessions, sending a request and response to another servlet using RequestDispatcher, objects created at deployment time, using cookies for session tracking,
Quiz
The document is a quiz on JavaScript fundamentals containing multiple choice questions. Some key points:
- JavaScript is a scripting language designed to add interactivity to HTML pages.
- JavaScript code can be written directly in HTML pages, in external .js files included in HTML, or in the browser console.
- JavaScript is free to use, interpreted rather than compiled, and code is typically saved with a .js file extension.
- It is called a lightweight programming language as it can provide some programming functionality within browsers but is less powerful than languages like Java.
servlet db connectivity
This document discusses connecting a Java servlet application to a MySQL database. It includes code for a registration servlet that takes user input from a registration form, connects to the database, and inserts the user details. It also includes code for a login servlet that authenticates user credentials from the database and redirects to a success page if valid.
2.java script dom
The document discusses the JavaScript Document Object Model (DOM). It explains that every web page can be considered an object inside a browser window. The DOM represents the HTML document displayed in the window and has properties that allow accessing and modifying document content. It outlines the hierarchical structure of objects in a web document, including the window, document, form, and form control element objects. It provides examples of using DOM properties and methods to get elements by ID, name, or tag name and manipulate the document.
1.java script
JavaScript is a lightweight programming language used to build interactive effects into web pages. It is interpreted rather than compiled, and is most commonly used on the client-side to manipulate web page content and interact with users. JavaScript code can be added directly via <script> tags or referenced externally. It allows for dynamic content, user feedback without page reloads, and richer interfaces. Limitations include a lack of file access from the client-side for security reasons and no multithreading capabilities. Basic form validation with JavaScript confirms required fields are completed and email addresses are properly formatted.
Quiz javascript
This document contains a 10-question quiz about JavaScript. The questions cover topics such as what JavaScript is used for, how it is written and included in HTML, whether it is a compiled or interpreted language, and more. The document provides multiple choice answers for each question and occasionally includes short explanations for certain answers.
Thread&multithread
The document discusses threads in Java. It defines a thread as the smallest unit of processing and notes that threads are lightweight subprocesses that allow for independent execution. It describes the five states in a thread's lifecycle and how threads can be created by extending the Thread class or implementing the Runnable interface. The summary provides an overview of the key topics covered in the document regarding threads in Java.
String
The document discusses Strings in Java. It defines a String as a sequence of characters that is represented as an object of the String class in Java. It describes two ways to create String objects: using string literals with double quotes or the new keyword with a character array. The document provides examples of creating Strings with these methods and describes some common String methods like charAt(), length(), compare(), etc.
Streams&io
The document discusses streams and strings in Java. There are two types of streams - input streams which read data from a source, and output streams which write data to a destination. An example is provided that copies the contents of one file to another using input and output streams. The Java String class implements various interfaces and provides many methods for string operations like compare, concat, length, and substring. Further code examples demonstrate creating strings and using the charAt method.
Packages
This document discusses Java packages. It explains that a Java package is a group of similar classes, interfaces, and sub-packages. There are built-in Java packages like java, lang, and awt as well as user-defined packages. Packages help categorize and organize code to avoid naming collisions and provide access protection. The document provides an example of creating a simple package called "mypack" and running a class within that package. It also discusses how to access classes from one package in another package using imports.
Interface in java
This document discusses interfaces in Java. It defines an interface as a blueprint of a class that defines static constants and abstract methods. Interfaces are used to achieve abstraction and multiple inheritance in Java. They represent an "is-a" relationship. There are three main reasons to use interfaces - for abstraction, to support multiple inheritance functionality, and to achieve loose coupling. The document provides examples of interfaces, such as a Printable interface and implementations in different classes. It also demonstrates multiple inheritance using interfaces and interface inheritance.
Inner classes in java
- Java inner classes are classes declared within other classes or interfaces. They allow grouping of logically related classes and interfaces and can access all members of the outer class, including private ones.
- There are three main advantages of inner classes: they can access private members of the outer class, they make code more readable by grouping related classes, and they require less code.
- The two types of inner classes are non-static (inner) classes and static nested classes. Non-static classes can access outer class members like private variables while static classes cannot access non-static members only static ones.
- Examples demonstrate member inner classes, anonymous inner classes, local inner classes, and static nested classes in Java and how they can
Inheritance
Inheritance in Java allows classes to inherit properties and behaviors from parent classes. There are three basic types of inheritance: single, multilevel, and hierarchical. Inheritance promotes code reuse and allows method overriding for runtime polymorphism. The syntax to define a subclass that inherits from a superclass uses the "extends" keyword. An example shows a Programmer class inheriting the salary field from the Employee class and defining its own bonus field. Multiple inheritance is not supported in Java because it could cause ambiguity in determining which parent class method to invoke.
Exception handling
The document discusses exception handling in Java. It begins by defining exceptions as abnormal runtime errors. It then explains the five keywords used for exception handling in Java: try, catch, throw, throws, and finally. It provides examples of using these keywords and describes their purposes. Specifically, it explains that try is used to monitor for exceptions, catch handles caught exceptions, throw explicitly throws exceptions, throws specifies exceptions a method can throw, and finally contains cleanup code. The document also discusses uncaught exceptions, multiple catch blocks, nested try blocks, and the finally block. It provides syntax and examples for different exception handling concepts in Java.
Abstract class
An abstract class in Java is a class declared with the abstract keyword. It can contain both abstract and non-abstract methods, with abstract methods having no body. Abstract classes focus on what an object does rather than how, hiding implementation details. They must be extended and have their abstract methods implemented before being instantiated. For example, an abstract Bike class declares an abstract run() method, and a Honda4 class extends Bike and provides a run() method body.
7. tuples, set & dictionary
This document discusses tuples, sets, and dictionaries in Python. Tuples are immutable lists while sets store unique elements without order. Dictionaries store key-value pairs allowing fast access via keys. The document provides examples of creating, manipulating and performing operations on these data structures. It also compares the performance of sets versus lists and presents a case study counting word occurrences using a dictionary.
6. list
This document discusses various methods for working with lists in Python. It covers how to create lists, common list methods like append and insert, built-in functions like len and random.shuffle, accessing list elements using indexes, slicing lists, list operators like + and in, list comprehensions, comparing lists, splitting strings into lists, and examples of using lists for problems involving lottery numbers, cards, and letter frequencies. It also discusses passing lists to functions, copying lists, and searching lists using linear and binary search algorithms.
5. string
The document discusses various methods for working with string objects in Python. It covers how to create, access, modify, compare and search strings. Some key string methods mentioned include len() to get the length, slicing to extract substrings, concatenation with +, checking for substrings with in/not in, comparing with relational operators, iterating with for loops, testing characters with isalpha() etc. and searching/replacing with endswith(), find(), replace() among others.
4. functions
The document describes functions in Python. It defines what a function is, how to define and invoke functions, and how functions work. It discusses function headers, parameters, arguments, return values, and function bodies. Examples are provided to demonstrate defining a max() function to return the maximum of two numbers, and testing/invoking the function. The use of functions to organize code and enable reuse is discussed.
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Applets
- 1. - Arulkumar V Assistant Professor, SECE Java - Applet Basics
- 2. Applet 12/19/20172 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.
- 3. 12/19/20173 Advantage of Applet There are many advantages of applet. They are as follows: It works at client side so less response time. Secured It can be executed by browsers running under many plateforms, including Linux, Windows, Mac Os etc.
- 4. Lifecycle of Java Applet 12/19/20174 Applet is initialized. Applet is started. Applet is painted. Applet is stopped. Applet is destroyed
- 5. java.applet.Applet class 12/19/20175 For creating any applet java.applet.Applet class must be inherited. It provides 4 life cycle methods of applet. public void init(): is used to initialized the Applet. It is invoked only once. public void start(): is invoked after the init() method or browser is maximized. It is used to start the Applet. public void stop(): is used to stop the Applet. It is invoked when Applet is stop or browser is minimized. public void destroy(): is used to destroy the Applet. It is invoked only once.
- 6. Ex 12/19/20176 //First.java import java.applet.Applet; import java.awt.Graphics; public class First extends Applet{ public void paint(Graphics g){ g.drawString("welcome",150,150); } }
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- 9. 12/19/20179
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