This document provides an overview of Java and how to learn it on your own. It discusses Java features like being simple, object-oriented, distributed, robust, and having GUI and multi-threading capabilities. It also covers Java being cross-platform due to its interpretive execution. The document then presents two sample Java programs - a standalone program and an applet. Finally, it recommends a three stage approach to self-learning Java, covering basic, mid-level and advanced topics, and lists resources like books, websites and IDEs to support the learning process.
Core java over view basics introduction by quontra solutionsQUONTRASOLUTIONS
Java is an object-oriented programming language that is portable, robust, and dynamic. It is commonly used to build web applications using a three-tier architecture model. Java applications are compiled into bytecode that runs on a virtual machine, allowing them to run on any device that supports Java. The document discusses Java's features such as simplicity, object-orientation, distribution, robustness, and cross-platform capabilities. It also covers different types of Java programs including standalone programs, applets, servlets, and more.
This document provides an overview of Java and two simple Java programs - a standalone program and an applet. It discusses what Java is, its features like being simple, object-oriented, robust, and cross-platform. It then shows code for a standalone Java program that prints a message and an applet that draws a string. Both import necessary classes and have main and paint methods to run the code.
This document contains notes on Java basics from James Tam. It introduces Java programming concepts like input, output, branching, and looping. It also discusses the history of Java's development at Sun Microsystems and how it enables programs to run on different platforms. Finally, it provides an overview of compiling and running a simple Java program from the command line.
This document provides an introduction to creating Java programs. It discusses inputs, outputs, branching, looping, and some history of Java's development. It then explains how to write the simplest possible Java program that outputs "Hello World!" to demonstrate the basic structure and syntax of a Java program.
Java is a widely used programming language that is mainly used for application programming. It is platform-independent and supports features like multi-threading and documentation comments. The key aspects of a simple Java program are that it must contain a class with a main method that can be the starting point of execution. The main method has a specific signature of public static void main(String[] args). When a Java program is run, the JVM (Java Virtual Machine) loads and executes the program by performing operations like loading code, verifying code, and providing a runtime environment.
This document provides an introduction to the Java programming language. It discusses that Java was originally called Oak and developed by Sun Microsystems in 1991. It was later renamed to Java in 1995. The key goals of Java are for programs to run on a variety of computer systems and devices. Java uses a software platform consisting of the Java Virtual Machine (JVM) and Java APIs. The document then discusses several features of Java that make it a good programming language choice, such as its simplicity, object-oriented nature, security, portability, and performance. It also explains how Java is architecture neutral through the use of bytecode that is run by the JVM.
This document provides an overview of key concepts in the Java programming language including classes, objects, inheritance, interfaces, packages, exceptions, threads, and more. It discusses how to build standalone Java programs and applets, and covers basic syntax and structures like primitive data types, expressions, control statements, and comments. Methods, constructors, and access modifiers are also explained at a high level.
Core java over view basics introduction by quontra solutionsQUONTRASOLUTIONS
Java is an object-oriented programming language that is portable, robust, and dynamic. It is commonly used to build web applications using a three-tier architecture model. Java applications are compiled into bytecode that runs on a virtual machine, allowing them to run on any device that supports Java. The document discusses Java's features such as simplicity, object-orientation, distribution, robustness, and cross-platform capabilities. It also covers different types of Java programs including standalone programs, applets, servlets, and more.
This document provides an overview of Java and two simple Java programs - a standalone program and an applet. It discusses what Java is, its features like being simple, object-oriented, robust, and cross-platform. It then shows code for a standalone Java program that prints a message and an applet that draws a string. Both import necessary classes and have main and paint methods to run the code.
This document contains notes on Java basics from James Tam. It introduces Java programming concepts like input, output, branching, and looping. It also discusses the history of Java's development at Sun Microsystems and how it enables programs to run on different platforms. Finally, it provides an overview of compiling and running a simple Java program from the command line.
This document provides an introduction to creating Java programs. It discusses inputs, outputs, branching, looping, and some history of Java's development. It then explains how to write the simplest possible Java program that outputs "Hello World!" to demonstrate the basic structure and syntax of a Java program.
Java is a widely used programming language that is mainly used for application programming. It is platform-independent and supports features like multi-threading and documentation comments. The key aspects of a simple Java program are that it must contain a class with a main method that can be the starting point of execution. The main method has a specific signature of public static void main(String[] args). When a Java program is run, the JVM (Java Virtual Machine) loads and executes the program by performing operations like loading code, verifying code, and providing a runtime environment.
This document provides an introduction to the Java programming language. It discusses that Java was originally called Oak and developed by Sun Microsystems in 1991. It was later renamed to Java in 1995. The key goals of Java are for programs to run on a variety of computer systems and devices. Java uses a software platform consisting of the Java Virtual Machine (JVM) and Java APIs. The document then discusses several features of Java that make it a good programming language choice, such as its simplicity, object-oriented nature, security, portability, and performance. It also explains how Java is architecture neutral through the use of bytecode that is run by the JVM.
This document provides an overview of key concepts in the Java programming language including classes, objects, inheritance, interfaces, packages, exceptions, threads, and more. It discusses how to build standalone Java programs and applets, and covers basic syntax and structures like primitive data types, expressions, control statements, and comments. Methods, constructors, and access modifiers are also explained at a high level.
The document discusses Java bytecode and the Java Virtual Machine (JVM). It provides details on:
- Bytecode is machine language for the JVM and is stored in class files. Each method has its own bytecode stream.
- Bytecode instructions consist of opcodes and operands that are executed by the JVM. Common opcodes include iconst_0, istore_0, iinc, iload_0, etc.
- The JVM has various components like the class loader, runtime data areas (method area, heap, stacks), and execution engine that interprets or compiles bytecode to machine code.
01. Introduction to programming with javaIntro C# Book
In this chapter we will take a look at the basic programming terminology and we will write our first Java program. We will familiarize ourselves with programming – what it means and its connection to computers and programming languages.
This document provides an introduction to the Java programming language created by Sun Microsystems. It discusses that Java is a platform-independent, object-oriented programming language. It also covers key Java concepts like the Java Virtual Machine, bytecode, packages, classes and objects, inheritance, abstract classes, exceptions, threads, and access modifiers. The document provides examples to illustrate Java features and how to write simple Java programs.
This extensive course covers all the topics which will definitely make you a Java Superstar. You can do almost anything in Java after this course. You will surely be a better programmer and better still a Elegant programmer after this course.
Introduction to Java Programming, Basic Structure, variables Data type, input...Mr. Akaash
This is First Lecture of java Programming which cover all basic points (ie. History and feature of java, Introduction to java, about variables data type and compilation....
The document provides information about Java, including:
- Java is an object-oriented programming language that is platform independent and can be used to create applications for web, desktops, mobile devices, and more.
- Java was originally developed in the early 1990s by James Gosling at Sun Microsystems for use in set-top boxes, but became popular for building web applications and is now widely used.
- The Java Development Kit (JDK) includes tools like javac, java, javadoc and others needed to develop, compile, run and document Java programs, as well as class libraries and documentation. The JVM executes compiled Java code.
The document discusses Java Beans, Applets, JDBC, Networking in Java, JNDI, and some key classes used in these technologies. It provides an overview of concepts like Java Beans components, properties, events, introspection, customization, persistence. It describes the lifecycle and methods of Applets. It outlines the basic steps to use JDBC like loading drivers, establishing connections, executing queries. It discusses connection-oriented and connectionless networking in Java and common network classes like Socket, ServerSocket, URL, URLConnection. It provides a high-level overview of the JNDI architecture.
Java is a programming language and platform that is commonly used to develop desktop applications, web applications, mobile apps, and more. The document introduces Java by explaining what it is, where it is used, the types of Java applications that can be created, and how the Java compilation and execution process works at a high level. It also provides an example "Hello World" Java program to demonstrate the basic anatomy of a Java file, including classes, methods, and how the main method acts as the program entry point.
This document discusses Java classes and bytecode. It begins by explaining what classes are and how they are loaded and used. It then discusses classloaders and how classes can be loaded from different classloaders. The document explores aspects of aspect-oriented programming including Java proxies, Spring AOP, and AspectJ. It discusses how to write bytecode at runtime and instruments classes. Finally, it provides an overview of concepts related to aspects in AspectJ such as pointcuts, join points, and advice.
The document provides an overview of advance Java topics including collections, multithreading, networking, AWT, Swing, JDBC, JSP, and applets. It discusses key aspects of each topic such as the collection framework providing interfaces and classes for storing and manipulating groups of data, multithreading allowing programs to perform multiple tasks simultaneously, and JDBC enabling connection between Java applications and databases. Code examples are also included to demonstrate concepts like a basic Swing program and a simple applet.
This document provides an overview of the Java programming language and environment. It discusses that Java is both a programming language and platform, and describes some of Java's key characteristics like being object-oriented, platform independent, secure, robust and high performance. It also outlines the different types of applications that can be created in Java, such as standalone, web, enterprise and mobile applications. The document concludes by explaining the basic steps to compile and run a simple Java program, and some modifications that can be made to the main method.
This document provides an introduction to Java applications and applets. It discusses that Java can be used to develop both standalone applications and programs designed to run in web browsers (applets). It then covers the history and development of Java, the basic characteristics and components of Java programs, and how to create a simple Java application with classes, methods, and a main method. It also introduces applets, describing them as Java programs embedded in web pages, and covers some key applet methods like init() and paint(). Finally, it provides an example of a basic applet class that draws shapes and text and the HTML required to embed an applet in a web page.
This document provides an overview of Java basics, including:
- Java programs are portable across operating systems due to use of byte code, a standardized class library, and language specification.
- Java is secure through features like no pointer arithmetic, garbage collection, and restrictions on applets.
- Java is robust with features like bounds checking and garbage collection that prevent crashes.
- Java programs are either standalone applications or applets that run in a web browser.
- The Java compiler translates source code to byte code, which is then interpreted at runtime.
In this Java tutorial, we are going to learn about java evolution, development of Java language, java features, Java frameworks, and Java support systems. Java tutorial covers various development tools, classes in Java programming, and Java methods which comprises the Java environment. This tutorial on java will help you get a quick insight into the Java programming language and thus, help you learn java language.
Introduction to the Java bytecode - So@t - 20130924yohanbeschi
This document contains the slides from a presentation on Java bytecode. It begins with an introduction to the speaker and their expertise. It then provides an overview of what topics will and won't be covered in the presentation. The document dives into details about bytecode, the class file format, descriptors, and the inner workings of the Java Virtual Machine (JVM). It explains how bytecode is executed on the JVM stack and frames. The key aspects of running Java code from source to bytecode to execution on the JVM are summarized.
C++ is a widely used programming language that supports object-oriented programming. This document provides an overview of C++ and discusses how to set up the necessary environment to start programming in C++, including installing a text editor and C++ compiler. It also covers basic C++ syntax, variables, data types, operators, and more fundamental concepts to get started with C++ programming.
The document discusses transaction management in database systems. It defines a transaction as a series of reads and writes to database objects that must be atomic, consistent, isolated, and durable (ACID properties). Allowing concurrent transactions can cause anomalies if their interleaved execution results in inconsistent data. Strict two-phase locking enforces serializability to avoid anomalies by requiring transactions to obtain shared or exclusive locks before reading or writing data. The database management system uses logging and two-phase commit to ensure atomicity and recover from failures.
This document discusses object-oriented programming concepts in Java including classes, objects, inheritance, encapsulation, and interfaces. It defines key terms like class, object, inheritance, and encapsulation. It explains that a class acts as a template that defines common attributes and behaviors of objects. Inheritance allows subclasses to extend and specialize the behaviors of parent classes. Encapsulation separates an object's internal state from its external interface. The document also covers other concepts like polymorphism, abstraction, and interfaces.
IPv4 is the fourth version of the Internet Protocol (IP) and the first widely deployed. It uses 32-bit addresses and supports three addressing modes: unicast, broadcast, and multicast. IPv4 addresses are hierarchical and contain network and host identification information. Subnet masks are used to distinguish the network and host portions of an IPv4 address. There are five classes of IPv4 addresses - A, B, C, D and E - designed for different sized networks.
This document provides an overview of IPv6, the latest revision of the Internet Protocol. IPv6 was developed by IETF to address the problem of IPv4 address exhaustion, as IPv4 addresses were being depleted. IPv6 features a much larger 128-bit address space compared to 32-bits in IPv4, providing vastly more unique IP addresses. It also includes improvements in routing, network autoconfiguration, security, quality of service, and mobility support. The document discusses the history and development of IPv6, as well as its addressing modes, address types, headers, communication methods, and transition technologies from IPv4 to IPv6 networks.
The document discusses Java bytecode and the Java Virtual Machine (JVM). It provides details on:
- Bytecode is machine language for the JVM and is stored in class files. Each method has its own bytecode stream.
- Bytecode instructions consist of opcodes and operands that are executed by the JVM. Common opcodes include iconst_0, istore_0, iinc, iload_0, etc.
- The JVM has various components like the class loader, runtime data areas (method area, heap, stacks), and execution engine that interprets or compiles bytecode to machine code.
01. Introduction to programming with javaIntro C# Book
In this chapter we will take a look at the basic programming terminology and we will write our first Java program. We will familiarize ourselves with programming – what it means and its connection to computers and programming languages.
This document provides an introduction to the Java programming language created by Sun Microsystems. It discusses that Java is a platform-independent, object-oriented programming language. It also covers key Java concepts like the Java Virtual Machine, bytecode, packages, classes and objects, inheritance, abstract classes, exceptions, threads, and access modifiers. The document provides examples to illustrate Java features and how to write simple Java programs.
This extensive course covers all the topics which will definitely make you a Java Superstar. You can do almost anything in Java after this course. You will surely be a better programmer and better still a Elegant programmer after this course.
Introduction to Java Programming, Basic Structure, variables Data type, input...Mr. Akaash
This is First Lecture of java Programming which cover all basic points (ie. History and feature of java, Introduction to java, about variables data type and compilation....
The document provides information about Java, including:
- Java is an object-oriented programming language that is platform independent and can be used to create applications for web, desktops, mobile devices, and more.
- Java was originally developed in the early 1990s by James Gosling at Sun Microsystems for use in set-top boxes, but became popular for building web applications and is now widely used.
- The Java Development Kit (JDK) includes tools like javac, java, javadoc and others needed to develop, compile, run and document Java programs, as well as class libraries and documentation. The JVM executes compiled Java code.
The document discusses Java Beans, Applets, JDBC, Networking in Java, JNDI, and some key classes used in these technologies. It provides an overview of concepts like Java Beans components, properties, events, introspection, customization, persistence. It describes the lifecycle and methods of Applets. It outlines the basic steps to use JDBC like loading drivers, establishing connections, executing queries. It discusses connection-oriented and connectionless networking in Java and common network classes like Socket, ServerSocket, URL, URLConnection. It provides a high-level overview of the JNDI architecture.
Java is a programming language and platform that is commonly used to develop desktop applications, web applications, mobile apps, and more. The document introduces Java by explaining what it is, where it is used, the types of Java applications that can be created, and how the Java compilation and execution process works at a high level. It also provides an example "Hello World" Java program to demonstrate the basic anatomy of a Java file, including classes, methods, and how the main method acts as the program entry point.
This document discusses Java classes and bytecode. It begins by explaining what classes are and how they are loaded and used. It then discusses classloaders and how classes can be loaded from different classloaders. The document explores aspects of aspect-oriented programming including Java proxies, Spring AOP, and AspectJ. It discusses how to write bytecode at runtime and instruments classes. Finally, it provides an overview of concepts related to aspects in AspectJ such as pointcuts, join points, and advice.
The document provides an overview of advance Java topics including collections, multithreading, networking, AWT, Swing, JDBC, JSP, and applets. It discusses key aspects of each topic such as the collection framework providing interfaces and classes for storing and manipulating groups of data, multithreading allowing programs to perform multiple tasks simultaneously, and JDBC enabling connection between Java applications and databases. Code examples are also included to demonstrate concepts like a basic Swing program and a simple applet.
This document provides an overview of the Java programming language and environment. It discusses that Java is both a programming language and platform, and describes some of Java's key characteristics like being object-oriented, platform independent, secure, robust and high performance. It also outlines the different types of applications that can be created in Java, such as standalone, web, enterprise and mobile applications. The document concludes by explaining the basic steps to compile and run a simple Java program, and some modifications that can be made to the main method.
This document provides an introduction to Java applications and applets. It discusses that Java can be used to develop both standalone applications and programs designed to run in web browsers (applets). It then covers the history and development of Java, the basic characteristics and components of Java programs, and how to create a simple Java application with classes, methods, and a main method. It also introduces applets, describing them as Java programs embedded in web pages, and covers some key applet methods like init() and paint(). Finally, it provides an example of a basic applet class that draws shapes and text and the HTML required to embed an applet in a web page.
This document provides an overview of Java basics, including:
- Java programs are portable across operating systems due to use of byte code, a standardized class library, and language specification.
- Java is secure through features like no pointer arithmetic, garbage collection, and restrictions on applets.
- Java is robust with features like bounds checking and garbage collection that prevent crashes.
- Java programs are either standalone applications or applets that run in a web browser.
- The Java compiler translates source code to byte code, which is then interpreted at runtime.
In this Java tutorial, we are going to learn about java evolution, development of Java language, java features, Java frameworks, and Java support systems. Java tutorial covers various development tools, classes in Java programming, and Java methods which comprises the Java environment. This tutorial on java will help you get a quick insight into the Java programming language and thus, help you learn java language.
Introduction to the Java bytecode - So@t - 20130924yohanbeschi
This document contains the slides from a presentation on Java bytecode. It begins with an introduction to the speaker and their expertise. It then provides an overview of what topics will and won't be covered in the presentation. The document dives into details about bytecode, the class file format, descriptors, and the inner workings of the Java Virtual Machine (JVM). It explains how bytecode is executed on the JVM stack and frames. The key aspects of running Java code from source to bytecode to execution on the JVM are summarized.
C++ is a widely used programming language that supports object-oriented programming. This document provides an overview of C++ and discusses how to set up the necessary environment to start programming in C++, including installing a text editor and C++ compiler. It also covers basic C++ syntax, variables, data types, operators, and more fundamental concepts to get started with C++ programming.
The document discusses transaction management in database systems. It defines a transaction as a series of reads and writes to database objects that must be atomic, consistent, isolated, and durable (ACID properties). Allowing concurrent transactions can cause anomalies if their interleaved execution results in inconsistent data. Strict two-phase locking enforces serializability to avoid anomalies by requiring transactions to obtain shared or exclusive locks before reading or writing data. The database management system uses logging and two-phase commit to ensure atomicity and recover from failures.
This document discusses object-oriented programming concepts in Java including classes, objects, inheritance, encapsulation, and interfaces. It defines key terms like class, object, inheritance, and encapsulation. It explains that a class acts as a template that defines common attributes and behaviors of objects. Inheritance allows subclasses to extend and specialize the behaviors of parent classes. Encapsulation separates an object's internal state from its external interface. The document also covers other concepts like polymorphism, abstraction, and interfaces.
IPv4 is the fourth version of the Internet Protocol (IP) and the first widely deployed. It uses 32-bit addresses and supports three addressing modes: unicast, broadcast, and multicast. IPv4 addresses are hierarchical and contain network and host identification information. Subnet masks are used to distinguish the network and host portions of an IPv4 address. There are five classes of IPv4 addresses - A, B, C, D and E - designed for different sized networks.
This document provides an overview of IPv6, the latest revision of the Internet Protocol. IPv6 was developed by IETF to address the problem of IPv4 address exhaustion, as IPv4 addresses were being depleted. IPv6 features a much larger 128-bit address space compared to 32-bits in IPv4, providing vastly more unique IP addresses. It also includes improvements in routing, network autoconfiguration, security, quality of service, and mobility support. The document discusses the history and development of IPv6, as well as its addressing modes, address types, headers, communication methods, and transition technologies from IPv4 to IPv6 networks.
Here is a potential solution to the problem in C++:
#include <iostream>
using namespace std;
int main() {
int num1, num2, num3;
cout << "Enter three numbers: ";
cin >> num1 >> num2 >> num3;
int total = num1 + num2 + num3;
float average = total / 3.0;
cout << "The numbers entered were: " << num1 << ", " << num2 << ", " << num3 << endl;
cout << "Their average is: " << average;
return 0;
}
Some key points:
- Use cin to input the 3 numbers from the
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This document provides an overview of Java basics, including:
- Java programs are portable across operating systems due to features like the Java language specification, portable class library, and use of bytecode instead of machine code.
- Java is secure due to lack of pointer arithmetic, garbage collection, bounds checking, and restrictions on applets.
- Java is robust with features that avoid crashes like bounds checking and exceptions.
- Java programs come in the form of standalone applications or applets, with differences in file I/O restrictions and need to handle browser lifecycle methods.
- The Java compiler produces bytecode files that are dynamically linked and executed by the Java runtime on any platform.
This document provides an overview of Java basics, including:
- Java programs are portable across operating systems due to features like the Java language specification, portable class library, and use of bytecode instead of machine code.
- Java is secure due to lack of pointer arithmetic, garbage collection, bounds checking, and restrictions on applets.
- Java is robust with features that avoid crashes like bounds checking and exceptions.
- Java programs come in the form of standalone applications or applets, with differences in file I/O restrictions and need to handle browser lifecycle methods.
- The Java compiler produces bytecode files that are dynamically loaded and linked at runtime.
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Java programs are portable across operating systems due to three features: 1) the standardized Java language, 2) the portable class library, and 3) translating source code to portable byte code rather than platform-specific machine code. The Java language is secure through interpreter-level checks and browser-level restrictions for applets. It is also robust through features like garbage collection and bounds checking that prevent crashes. Java programs come in two flavors - standalone applications or applets for web programming. Applets have additional restrictions and predefined lifecycle methods that are automatically invoked by web browsers.
The document provides an overview of object oriented programming with Java. It discusses the differences between C++ and Java, the fundamentals of Java programming, and tools available for Java development. Key points include:
- Java is best suited for internet applications while C++ is better for large software.
- Java supports interfaces, packages, and other features not in C++.
- The Java Development Kit (JDK) contains compilers and other tools for creating Java programs.
- Java applications are standalone programs while applets are embedded in web pages.
The document provides an introduction to the Java programming language. It discusses that Java was created by Sun Microsystems to allow web pages to include interactive Java code. It is a simple, object-oriented, portable language that uses bytecode and a virtual machine to achieve platform independence. The document outlines Java's core features such as being distributed, multithreaded, robust, secure, and high performance. It also summarizes Java's basic data types, classes, objects, and how to write both applications and applets.
Java is a general-purpose programming language that is both compiled and interpreted. It allows developers to "write once, run anywhere," meaning that Java code can run on any device that supports a Java Virtual Machine (JVM), without needing to be recompiled. The key features of Java include being simple, object-oriented, robust, secure, portable, and high-performance. Java code is first compiled into bytecode, which can then be executed by a JVM on various operating systems like Windows, Linux, and macOS.
The document provides an introduction to Java servlets and JavaServer Pages (JSP). It discusses servlet lifecycles and interfaces like ServletRequest and RequestDispatcher. It covers session tracking techniques including cookies, hidden form fields, and URL rewriting. It also mentions servlet events and listeners.
The Java SDK comes in three versions for different platforms and purposes. It includes command line compilation and execution tools like javac and java but is not an IDE. Many IDEs are available both open source and commercial that provide integrated environments for Java development. The Java code lifecycle involves compiling Java source code to bytecode, verifying and interpreting the bytecode at runtime with the help of various runtime components like the classloader and JVM.
The document provides an overview of the Java programming language, including its history, core concepts, and execution process. Some key points:
- Java was created in 1991 by James Gosling at Sun Microsystems with an initial focus on embedded systems, but later expanded to web applications due to the rise of the Internet.
- The Java platform consists of the Java programming language, Java Virtual Machine (JVM), and Java Application Programming Interfaces (APIs). The JVM allows Java programs to run on any hardware/software platform.
- A Java program is compiled into bytecode that can be executed by any JVM, providing platform independence. The execution involves compiling the source code and then interpreting the bytecode on
Java Class 6 | Java Class 6 |Threads in Java| Applets | Swing GUI | JDBC | Ac...Sagar Verma
16. Threads in Java
Non-Threaded Applications
Threaded Applications
Process based multitasking Vs Thread based multitasking
Thread API in Java
Creating Threads
States of a Thread
Synchronization for threads; static and non-static synchronized methods; blocks; concept of object and class locks
Coordination between threads - wait, notify and notifyAll methods for inter-thread communication
17. Applets
What are applets?
Need for Applets
Different ways of running an applet program
Applet API hierarchy
Life Cycle of an applet
Even Handlers for applets, mouse events, click events
18. Swing GUI
Introduction to AWT
Introduction to Swing GUI
Advantages of Swing over AWT
Swing API
Swing GUI Components
Event Handlers for Swing
Sample Calculator application using Swing GUI and Swing Event handling
19. JDBC
What is JDBC; introduction
JDBC features
JDBC Drivers
Setting up a database and creating a schema
Writing JDBC code to connect to DB
CRUD Operations with JDBC
Statement types in JDBC
Types of Rowset, ResultSet in JDBC
20. Access Modifiers in Java
What are access modifiers?
Default
Protected
Private
Public
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The document provides an overview of object-oriented programming in Java. It discusses that Java was created to be portable and platform independent due to issues with C/C++. It then covers the history and evolutions of Java, the different Java editions, and defines Java as a general-purpose, object-oriented language. The document compares Java to C/C++ by outlining features removed or added in Java. It also describes characteristics of Java like being simple, robust, secure, portable, and platform independent. Finally, it discusses the Java environment, an example Hello World program, input/output in Java, and primitive data types.
- Java is a general-purpose, object-oriented programming language that is designed to be portable so that code written in Java can run on any platform that supports Java without being modified.
- Some key features of Java include being simple, platform-independent, secure, robust, and high-performance.
- Java code is compiled into bytecode that can run on any Java Virtual Machine (JVM) regardless of computer architecture. This allows Java programs to "write once, run anywhere."
- The most basic Java programs, like "Hello World," demonstrate use of the Java language and how to compile and run a Java application or applet.
- Java is a general-purpose, high-level programming language that is compiled to bytecode that runs on a Java Virtual Machine (JVM).
- Key features of Java include being platform-independent, object-oriented, robust, secure, and having a large standard library.
- To write a simple Java program, code is written in .java files, compiled to .class files, and run on a JVM. The "Hello World" example prints text to the console.
Java is an object-oriented programming language that is platform independent. It was developed by Sun Microsystems, now owned by Oracle. Java code is compiled into bytecode that runs on a Java Virtual Machine (JVM), allowing it to run on any device that supports a JVM. Java supports features like inheritance, polymorphism, and encapsulation. It is widely used for client-side applications like applets and server-side applications like servlets and Java Server Pages (JSP). The main Java editions are Java SE for desktop applications, Java EE for enterprise applications, and Java ME for mobile applications.
Java is an object-oriented programming language that is platform independent. It was developed by Sun Microsystems, now owned by Oracle. Java code is compiled into bytecode that runs on a Java Virtual Machine (JVM), allowing it to run on any device with a JVM. Java supports features like inheritance, polymorphism, and encapsulation. It is widely used for client-side applications like applets and server-side applications like servlets and Java Server Pages (JSP). The main Java editions are Java SE for desktop applications, Java EE for enterprise applications, and Java ME for mobile applications.
Java is an object-oriented programming language that is platform-independent. It uses classes and objects to create programs. The key steps to create a Java program are:
1. Write Java code in a .java file with the required classes and methods.
2. Compile the Java code using the javac compiler which produces .class files.
3. Run the program by executing the main method using the java command, which runs code from the .class files.
The example provided is an evolutionary design system written in Java. It uses classes like Model, EvoDesign, FitnessFn to set up a genetic algorithm for evolutionary design with methods for evaluating fitness, running the GA, and displaying
This document provides an overview of Java including its history, versions, key features, and basic programming concepts. It describes how Java was originally called Oak and later renamed to Java in 1995. It also lists the main Java versions from 1995 to 2011. Additionally, it defines Java as a platform independent language and outlines some of its common uses. The document proceeds to explain Java's main features such as being simple, object-oriented, platform independent, secure, portable, dynamic, high performance, and multithreaded. It also includes examples of a simple Java program, variables, and packages.
This document provides an introduction to Java programming and the Java development environment. It discusses what computer programming is, defines the key phases of programming, and presents a simple "Hello World" Java program as an example. It also covers Java concepts like case sensitivity, formatting, and file naming conventions. The document explains how Java code is compiled and executed, and provides an overview of the Java programming language, virtual machine, class files, and class loaders. It introduces the Eclipse integrated development environment and demonstrates how to create a new Java project, write code, compile, run, and debug programs within Eclipse.
2. Today’s session
• Part-1) Java overview (5mins)
– What java is
– Java features
– Java’s cross-platform
• Part-2) two simple and typical java programs
– A stand-lone java and its running (5mins)
– A applet and its running (5mins)
• Part-3) how to learn java by yourself (5mins)
– 3 stages
– resources
4. What Java is
• Java is an “easy” programming language,
– just a tool like C++, VB, …and English. Somehow a
language tool itself is not so complex.
• Java works for internet project(mainly), and apply
“3-tired architecture”, coding on the server-side
– So besides Java language knowledge, we need to learn
lots of thing about telecommunication on WEB, to
finish a real-time project.
5. What Java is(continue)
• Java applies Object-Oriented Tech.
– Java is not so difficulty, though OOP is. A java
expert must be an OOP expert.
• Java is slower than C++ ( 3-5 times), Java’s
database function is slower than VB.
• Java is very portable: cross-platform
6. Java’s Features
• Simple
Java omits many rarely used, poorly understood, confusing
features of C++. Say : No Pointer! No dynamic delete.
• Object Oriented
Object –oriented design is a technology that focuses design
on the data (object) and on the interfaces to it.
Let’s say, everything is an object, everything will
become a class in Java. Every java program, in top-
level view, is classes.
7. Java’s Features(continue)
• Distributed
Basically, Java is for Net-Work application, for WEB
project.
Java can open and access “objects” across the Net via
URLs (Uniform Resource Locator)----eg.
“http//:gamut.neiu.edu/~ylei/home.html”,
with the same ease as when accessing a local file system
8. Java’s Features(continue)
• Robust
The single biggest difference between Java
and C/C++ is that Java has “a inner safe
pointer-model”, therefore it eliminates the
possibility of overwriting memory and corrupting
data, so programmers feel very safe in coding.
9. Java’s Features(continue)
• GUI [Java-Swing]
For some reason, Sun believe their java-swing
is very important, so they always put it in their
certificate-tests.
• Multi-threaded
• Secure [ Exception handling ]
• Dynamic [ for Server-side coding]
10. Java’s cross-platform
• Interpreted Execute: cross-platform
why: For cross-platform purpose. Once coding, run anywhere.
The Java interpreter ( java.exe and its javaVirtualMachine) can
execute compiled Java-byte-codes(Xxx.class) directly on any machine to
which the interpreter has been ported.
How: ( eg. Dos command line style)
- Edit source code “demo.java” , by notepad/or other IDE tools
- Compile ( javac.exe ) “demo.java” javac Demo.java Java byte
codes, namely, Demo.class
- Execute (Interpreted Execute) java Demo
• Speed issue AND new solutions: java is slower than c++ in running.
however, by now, there are some new technology of Java compiler, such
as “Just-in-time”, and “HotSpot adaptive Compiler”. They make java
very faster than before.
11. Ps: Compiler and Interpreters: Run in Physical CPU
1. Compilers use the traditional compile/link/run strategy.
Examples: C, C++, ML.
source [complie] native-files [link] nativeprogram [run]
demo.c --- obj - demo.exe --Intel cpu
Demoh.h
1. Interpreters execute the source code directly. Examples:
BASIC, Perl, TCL/Tk, ML.
source [load] [interpret run]
demo.perl - source-program - Intel cpu
data
12. Java: Run in Virtual Cpu
:cross-platfrom
Demo.java Compile Demo.class link xxx.class
Source-code “javac” byte-code files bytecode
program
interpretedly run on VM |-- Intel CPU
(virtual CPU: JSDK ) |-- … CPU
|-- Apple CPU
13. Part-2 2 samples
• How many kinds of java programs ?
• Demo-1: Stand-lone sample
• Demo-2: an Applet sample
14. How many kinds of Java Programs?
• Un-network app.: (1)Standalone Java program (today)
• Network app: non-standalone Java program
Internet: (2)Applet , (today)
(3)servlet
(4)JavaBean classes
Intranet: (5)EJB ( EnterpriseJavaBean ),
(6)RMI, etc
15. Standalone Java Program
• The main() method
public static void main(String args[]){
...
}
public--- the interpreter can call it
static ----It is a static method belonging to the class
void -----It does not return a value
String----It always has an array of String objects as its formal parameter.
the array contains any arguments passed to the program on the
command line
the source file’s name must match the class name which main method is
in
16. Java program
1 // Fig. 2.1: Welcome1.java
2 // A first program in Java
3
4 public class Welcome1 {
5 public static void main( String args[] )
6 {
7 System.out.println( "Welcome to Java Programming!" );
8 }
Welcome to Java Programming!
9 }
17. Java program
1 // Fig. 2.1: Welcome1.java
2 // A first program in Java
3
4 public class Welcome1 {
5 public static void main( String args[] )
6 {
7 System.out.println( "Welcome to Java Programming!" );
8 }
9 }
18. A Simple GUI Program: Printing a
Line of Text
• Display
– Most Java applications use windows or a dialog box
• We have used command window
– Class JOptionPane allows us to use dialog boxes
• Packages
– Set of predefined classes for us to use
– Groups of related classes called packages
• Group of all packages known as Java class library or Java
applications programming interface (Java API)
– JOptionPane is in the javax.swing package
• Package has classes for using Graphical User Interfaces
(GUIs)
19. 1 // Fig. 2.6: Welcome4.java
2 // Printing multiple lines in a dialog box
3 import javax.swing.JOptionPane; // import class JOptionPane
4
5 public class Welcome4 {
6 public static void main( String args[] )
7 {
8 JOptionPane.showMessageDialog(
9 null, "WelcomentonJavanProgramming!" );
10
11 System.exit( 0 ); // terminate the program
12 }
13 }
20. Packages
• Like “namespace” in C++
• How to use:
– C++: using namespace xxx
– Java: import xxx, or
import xxx.xx
21. A Simple Java Applet: Drawing a
String
– appletviewer only understands
<applet> tags
• Ignores everything else
• Minimal browser
– Executing the applet
•appletviewer WelcomeApplet.html
• Perform in directory containing .class file
1 <html>
2 <applet code="WelcomeApplet.class" width=300 height=30>
3 </applet>
4 </html>
22. 1 // Fig. 3.6: WelcomeApplet.java
2 // A first applet in Java
33 import javax.swing.JApplet; // import class JApplet
4 import java.awt.Graphics; // import class Graphics
5
66 public class WelcomeApplet extends JApplet {
77 public void paint( Graphics g )
8 {
9 g.drawString( "Welcome to Java Programming!", 25, 25 );
10 }
11 }
1 <html>
2 <applet code="WelcomeApplet.class" width=300 height=30>
3 </applet>
4 </html>
import allows us to use
predefined classes (allowing
us to use applets and
graphics, in this case).
extends allows us to inherit the
capabilities of class JApplet.
Method paint is guaranteed to
be called in all applets. Its first
line must be defined as above.
23. 1 // Fig. 3.8: WelcomeApplet2.java
2 // Displaying multiple strings
3 import javax.swing.JApplet; // import class JApplet
4 import java.awt.Graphics; // import class Graphics
5
6 public class WelcomeApplet2 extends JApplet {
7 public void paint( Graphics g )
8 {
99 g.drawString( "Welcome to", 25, 25 );
10 g.drawString( "Java Programming!", 25, 40 );
11 }
12 }
1 <html>
2 <applet code="WelcomeApplet2.class" width=300 height=45>
3 </applet>
4 </html>
The two drawString statements
simulate a newline. In fact, the
concept of lines of text does not
exist when drawing strings.
24. 1 // Displaying text and lines
2 import javax.swing.JApplet; // import class JApplet
3 import java.awt.Graphics; // import class Graphics
4
5 public class WelcomeLines extends JApplet {
6 public void paint( Graphics g )
7 {
8 g.drawLine( 15, 10, 210, 10 );
99 g.drawLine( 15, 30, 210, 30 );
10 g.drawString( "Welcome to Java Programming!", 25, 25 );
11 }
12 }
1 <html>
2 <applet code="WelcomeLines.class" width=300 height=40>
3 </applet>
4 </html>
Draw horizontal lines with
drawLine (endpoints have same
y coordinate).
27. 3 Stages(cont’d)
S-3: Advanced projects
contents: JavaBeans
RMI
Servlets and JSP
EJB…
many topics
time: years , just do projects with Java
28. Self-training Resources:
in Stage-1 and Stage-2
• Sun’s free JSDK. Download and install it.
– By the way, many books give us a free CD of JSDK.
– Visit http://orion.neiu.edu/~ncaftori/
• Online books <<Thinking in Java>>, it has many
translated version, Japanese, Chinese, etc.
• Sun’s web training
• Other books:
– Sun’s <<core java>>, it’s the base of Sun’s certificate-
tests.
– <<Java:How to program>>, html style, friendly
• Search in http://deitel.com, a lots of sample codes
29. IDE’s: search Sun’s web:
sun.java.com
a. Jbuilder
b. Visual Age
c. Sun Forte
d. Visual Café
e. J++