DOCSLIB.ORG

Introduction to Java 1 / 1 What Is Java?

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Introduction to Java 1 / 1 What Is Java? The origins of Java Java was originally designed for interactive television, but it was too advanced technology for the digital cable television industry at the time. James Gosling, Mike Sheridan, and Patrick Naughton initiated the Java language project in June 1991. The small team of Sun Microsystems engineers was called Green Team. Firstly, James Gosling called the project ”Greentalk”, and the file extension was .gt. Later the project was called Oak as a symbol of strength. In 1995, Oak was renamed as Java because it was already a trademark by Oak Technologies. dr Anna Łazińska, WMiI UŁ Introduction to Java https://www.javatpoint.com 1 / 1 What is Java? Java is object-oriented programming language and a platform. Object-Oriented Programming is a methodology/paradigm to design a program using classes and objects. Any hardware or software environment in which a program runs, is known as a platform. Since Java has a runtime environment (JRE) and Application Programming Interface (API), it is called a platform. dr Anna Łazińska, WMiI UŁ Introduction to Java https://www.javatpoint.com 2 / 1 Basic concepts of object-oriented programming Object - a unit that has its address and allocated space in memory. An object is an instance (element) of a class. Class - set of objects. It is a logical unit that does not take up memory. It is a pattern of objects. Inheritance - the objects of a given class have the properties of the parent class, which makes possible to reuse the code. Method - subroutine of the class (function). Works for a given class and child classes. Polymorphism - one task can be done in various ways. In Java, overloading and overwriting methods are used for this purpose. Abstraction - hiding internal details and showing functionality (abstract class, interface). Encapsulation - hiding certain fields of objects or methods of a class. dr Anna Łazińska, WMiI UŁ Introduction to Java https://www.javatpoint.com 3 / 1 Compilation At compile time, the source file with the extension .java is compiled by the Java compiler (it does not interact with the operating system), which converts the Java code into bytecode. The bytecode can be executed by the Java Virtual Machine. dr Anna Łazińska, WMiI UŁ Introduction to Java https://www.javatpoint.com 4 / 1 JVM JVM (Java Virtual Machine) is an abstract machine. It is called a virtual machine because it doesn’t physically exist. It is a specification that provides a runtime environment in which Java bytecode can be executed. JVMs are available for many hardware and software platforms. JVM, JRE, and JDK are platform dependent because the configuration of each OS is different from each other. However, Java is platform independent. The JVM performs the following main tasks: Loads code Verifies code Executes code Provides runtime environment dr Anna Łazińska, WMiI UŁ Introduction to Java https://www.javatpoint.com 5 / 1 JRE, JDK JRE (Java Runtime Environment) is a set of software tools which are used for developing Java applications. It is used to provide the runtime environment. It is the implementation of JVM. It physically exists. It contains a set of libraries and other files that JVM uses at runtime. JDK (Java Development Kit) is a software development environment which is used to develop Java applications and applets. It physically exists. It contains JRE and development tools. dr Anna Łazińska, WMiI UŁ Introduction to Java https://www.javatpoint.com 6 / 1 JVM, JRE, JDK dr Anna Łazińska, WMiI UŁ Introduction to Java https://www.javatpoint.com 7 / 1 The first program class Hellof public static void main(String[] args)f System.out.println("Hello Java"); g g dr Anna Łazińska, WMiI UŁ Introduction to Java https://www.javatpoint.com 8 / 1.
Load more

Recommended publications
  • COMPUTER CHAPTER 4- INTRODUCING JAVA Introduction
    CLASS-11 SUBJECT – COMPUTER CHAPTER 4- INTRODUCING JAVA Introduction to Java programming JAVA was developed by Sun Microsystems Inc in 1991, later acquired by Oracle Corporation. It was developed by James Gosling and Patrick Naughton. It is a simple programming language. Writing, compiling and debugging a program is easy in java. It helps to create modular programs and reusable code. Bytecode javac compiler of JDK compiles the java source code into bytecode so that it can be executed by JVM. The bytecode is saved in a .class file by compiler. Java Virtual Machine (JVM) This is generally referred as JVM. Before, we discuss about JVM lets see the phases of program execution. Phases are as follows: we write the program, then we compile the program and at last we run the program. 1) Writing of the program is of course done by java programmer. 2) Compilation of program is done by javac compiler, javac is the primary java compiler included in java development kit (JDK). It takes java program as input and generates java bytecode as output. 3) In third phase, JVM executes the bytecode generated by compiler. This is called program run phase. So, now that we understood that the primary function of JVM is to execute the bytecode produced by compiler. Characteristics of Java Simple Java is very easy to learn, and its syntax is simple, clean and easy to understand. Multi-threaded Multithreading capabilities come built right into the Java language. This means it is possible to build highly interactive and responsive apps with a number of concurrent threads of activity.
    [Show full text]
  • IITM GROUP of INSTITUTIONS, MURTHAL SONIPAT What Is Java
    IITM GROUP OF INSTITUTIONS, MURTHAL SONIPAT DEPARTMENT: COMPUTER SCIENCE AND ENGG. SUBJECT: ADVANCE JAVA CSE-306B UNIT : 1 JAVA LANGUAGE BASICS JAVA: Java is a general-purpose, concurrent, object-oriented, class-based, and the runtime environment(JRE) which consists of JVM which is the cornerstone of the Java platform. This blog on What is Java will clear all your doubts about why to learn java, features and how it works. In this What is Java blog, I would be covering following topics: What is Java used for? History of Java What is Java? Features of Java Components in Java What is Java used for? Before I answer the question, what is Java used for, let me brief you about why you should choose Java. Java is highly popular and has dominated this field from early 2000‘s till the present 2018. Java has been used in different domains. Some of them are listed below: Banking: To deal with transaction management. Retail: Billing applications that you see in a store/restaurant are completely written in Java. Information Technology: Java is designed to solve implementation dependencies. Android: Applications are either written in Java or use Java API. Financial services: It is used in server-side applications. Stock market: To write algorithms as to which company they should invest in. Big Data: Hadoop MapReduce framework is written using Java. Scientific and Research Community: To deal with huge amount of data. Wait! Java can do more. 1 Let‘s see how some of the technologies make use of Java as an essential core of their functionalities.
    [Show full text]
  • Programming in Java Learning Objectives
    Programming in Java Learning objectives After undergoing the subject, students will be able to Understand the history of Java. Explain how Java programs are compiled, interpreted and executed in java environment. Explain how Java is used to develop different types of application Explain the concept of Packages and their uses Explain the concept of multithreading. Explain how we can build application with JDK. 1. History of Java Java Programming Language was written by James Gosling along with two other person ‘Mike Sheridan‘ and ‘Patrick Naughton‘, while they were working at Sun Microsystems. Initially it was named oak Programming Language. 1.1.Releases of Java Initial Java Versions 1.0 and 1.1 was released in the year 1996 for Linux, Solaris, Mac and Windows. Java version 1.2 (Commonly called as java 2) was released in the year 1998. Java Version 1.3 codename Kestrel was released in the year 2000. Java Version 1.4 codename Merlin was released in the year 2002. Java Version 1.5/Java SE 5 codename ‘Tiger’ was released in the year 2004. Java Version 1.6/Java SE 6 Codename ‘Mustang’ was released in the year 2006. Java Version 1.7/Java SE 7 Codename ‘Dolphin’ was released in the year 2011. Java Version 1.8 is the current stable release which was released this year (2015). 1.2. Five Goals which were taken into consideration while developing Java: Keep it simple, familiar and object oriented. Keep it Robust and Secure. Keep it architecture-neural and portable. Executable with High Performance. Interpreted, threaded and dynamic.
    [Show full text]
  • SUBJECT-COMPUTER CLASS-12 CHAPTER 9 – Compiling and Running Java Programs
    SUBJECT-COMPUTER CLASS-12 CHAPTER 9 – Compiling and Running Java Programs Introduction to Java programming JAVA was developed by Sun Microsystems Inc in 1991, later acquired by Oracle Corporation. It was developed by James Gosling and Patrick Naughton. It is a simple programming language. Writing, compiling and debugging a program is easy in java. It helps to create modular programs and reusable code. Bytecode javac compiler of JDK compiles the java source code into bytecode so that it can be executed by JVM. The bytecode is saved in a .class file by compiler. Java Virtual Machine (JVM) This is generally referred as JVM. Before, we discuss about JVM lets see the phases of program execution. Phases are as follows: we write the program, then we compile the program and at last we run the program. 1) Writing of the program is of course done by java programmer. 2) Compilation of program is done by javac compiler, javac is the primary java compiler included in java development kit (JDK). It takes java program as input and generates java bytecode as output. 3) In third phase, JVM executes the bytecode generated by compiler. This is called program run phase. So, now that we understood that the primary function of JVM is to execute the bytecode produced by compiler. Characteristics of Java Simple Java is very easy to learn, and its syntax is simple, clean and easy to understand. Multi-threaded Multithreading capabilities come built right into the Java language. This means it is possible to build highly interactive and responsive apps with a number of concurrent threads of activity.
    [Show full text]
  • Programming in Java Unit-I an Overview Of
    PROGRAMMING IN JAVA UNIT-I AN OVERVIEW OF JAVA: James Gosling, Patrick Naughton, Chris Worth, ED Frank and Mike Sheridan conceived Java at Sun Microsystems, Inc in 1991. It took 18 months to develop the first Working version. This language was initially called ‘OAK’ but was renamed “JAVA” in 1995. The primary motivation was the need for a platform-independent (i.e. architecture- neutral) language that could be used to create software to be embedded in various consumer electronic devices such as microwave oven and remote controls. As you can probably guess, many different types of CPU’s are used as controllers. The trouble with C and C++ (and most other languages) is that they are designed to be compiled for a specific target. Although it is possible to compile a C++ program for just about any type of CPU, to do so requires a full C++ compiler together for that CPU. The problems are that compilers are expensive and time consuming to create. An easier- more cost efficient solution was needed. In an attempt to find such a solution, Gosling and others began work on a portable, platform-independent language that could be used to produce code that would run on a variety of CPU’s under different environments. This effort ultimately led to the creation of Java. In 1993, the World Wide Web (WWW) appeared on the Internet and transformed the text-based Internet into a graphical rich environment. The project team came up with the idea of developing web applets (tiny programs) using the new language that could run on all types of computers connected to the Internet.
    [Show full text]
  • The Coffee Machine Potent Mercantile Metaphors of the Programming Language JAVA «
    Media Culture and Cultural Techniques Working Papers N°003 2020 » The Coffee Machine Potent Mercantile Metaphors of the Programming Language JAVA « Markus Krajewski Department Arts, Media, Philosophy N° 2020.003 »The Coffee Machine: Potent Mercantile Metaphors of the Programming Language JAVA« Markus Krajewski DOI: 10.5451/unibas-ep78171 Media Culture and Cultural Techniques working papers BMCCT veröffentlicht Arbeitspapiere im Forschungsbereich des Basler Seminars für Medienwissenschaft. Die Arbeitspapiere erscheinen in unregelmässigen Abständen in deutscher und englischer Sprache. BMCCT publishes working papers in the research area of the Basel Seminar for Media Studies. The working papers appear at irregular intervals in German and English. Cite this item: The »Basel Media Culture and Cultural Concept and design: Markus Krajewski, »The Coffee Machine Techniques Working Papers« (BMCCT Mario Wimmer Potent Mercantile Metaphors of the working papers) are published by Programming Language JAVA«, BMCCT Hosted by University of Basel library’s working papers, (August 2020) No.3 Seminar für Medienwissenschaft eterna server (DOI: 10.5451/unibas-ep78171). Universität Basel Holbeinstrasse 12 4051 Basel medienwissenschaft.philhist.unibas.ch [email protected] under the creative commons licence Department https://creativecommons.org/licenses/by/ Arts, Media, Philosophy 4.0/ ISSN 2673-5792 . The Coffee Machine Potent Mercantile Metaphors of the Programming Language JAVA . Markus Krajewski Department Arts, Media, Philosophy, University of Basel, [email protected] DOI:10.5451/unibas-ep78171 »Te best Java is a very excellent coffee« (Ralph Holt Cheney, 1925) 1. Prologue The Program of History In the beginning was Green, and Green was with Sun. »And the light shines on in the darkness, but the darkness has not mastered it« (NET Bible, John 1:5).
    [Show full text]
  • History of Java the History of Java Is Very Interesting. Java Was Originally Designed for Interactive Television, but It Was
    History of Java The history of Java is very interesting. Java was originally designed for interactive television, but it was too advanced technology for the digital cable television industry at the time. The history of java starts with Green Team. Java team members (also known as Green Team), initiated this project to develop a language for digital devices such as set-top boxes, televisions, etc. However, it was suited for internet programming. Later, Java technology was incorporated by Netscape. The principles for creating Java programming were "Simple, Robust, Portable, Platform-independent, Secured, High Performance, Multithreaded, Architecture Neutral, Object-Oriented, Interpreted and Dynamic". Currently, Java is used in internet programming, mobile devices, games, e-business solutions, etc. There are given the significant points that describe the history of Java. 1) James Gosling, Mike Sheridan, and Patrick Naughton initiated the Java language project in June 1991. The small team of sun engineers called Green Team. 2) Originally designed for small, embedded systems in electronic appliances like set-top boxes. 3) Firstly, it was called "Greentalk" by James Gosling, and file extension was .gt. 4) After that, it was called Oak and was developed as a part of the Green project. Why Java named "Oak"? 5) Why Oak? Oak is a symbol of strength and chosen as a national tree of many countries like U.S.A., France, Germany, Romania, etc. 6) In 1995, Oak was renamed as "Java" because it was already a trademark by Oak Technologies. Why Java Programming named "Java"? 7) Why had they chosen java name for java language? The team gathered to choose a new name.
    [Show full text]
  • Desenvolvimento OO Com Java O Que É Java
    Desenvolvimento OO com Java O que é Java Vítor E. Silva Souza ([email protected]) http://www.inf.ufes.br/~vitorsouza Departamento de Informática Centro Tecnológico Universidade Federal do Espírito Santo Licença para uso e distribuição • Este obra está licenciada com uma licença Creative Commons Atribuição-CompartilhaIgual4.0 Internacional; • Você tem o direito de: – Compartilhar: copiar e redistribuir o material em qualquer suporte ou formato – Adaptar: remixar, transformar, e criar a partir do material para qualquer fim, mesmo que comercial. • De acordo com os termos seguintes: – Atribuição: você deve dar o crédito apropriado, prover um link para a licença e indicar se mudanças foram feitas. Você deve fazê-lo em qualquer circunstância razoável, mas de maneira alguma que sugira ao licenciante a apoiar você ou o seu uso; – CompartilhaIgual: se você remixar, transformar, ou criar a partir do material, tem de distribuir as suas contribuições sob a mesma licença que o original. Mais informações podem ser encontradas em: http://creativecommons.org/licenses/by-sa/4.0/ Março 2016 OO & Java - O que é Java 2 Conteúdo do curso • O que é Java; • Herança, reescrita e • Variáveis primitivas e polimorfismo; controle de fluxo; • Classes abstratas; • Orientação a objetos • Interfaces; básica; • Exceções e controle de • Um pouco de vetores; erros; • Modificadores de acesso • Utilitários da API Java. e atributos de classe; Estes slides foram baseados na apostila do curso FJ-11: Java e Orientação a Objetos da Caelum e na apostila Programação Orientada a Objetos em Java do prof. Flávio Miguel Varejão. Março 2016 OO & Java - O que é Java 3 O que é Java? • Uma tecnologia; • Uma linguagem de programação; • Uma plataforma de desenvolvimento; • Um software distribuído pela Oracle; • Um ambiente de execução de programas; • Uma ilha da Indonésia (e o mar ao norte da ilha).
    [Show full text]
  • Java (Software Platform) from Wikipedia, the Free Encyclopedia Not to Be Confused with Javascript
    Java (software platform) From Wikipedia, the free encyclopedia Not to be confused with JavaScript. This article may require copy editing for grammar, style, cohesion, tone , or spelling. You can assist by editing it. (February 2016) Java (software platform) Dukesource125.gif The Java technology logo Original author(s) James Gosling, Sun Microsystems Developer(s) Oracle Corporation Initial release 23 January 1996; 20 years ago[1][2] Stable release 8 Update 73 (1.8.0_73) (February 5, 2016; 34 days ago) [±][3] Preview release 9 Build b90 (November 2, 2015; 4 months ago) [±][4] Written in Java, C++[5] Operating system Windows, Solaris, Linux, OS X[6] Platform Cross-platform Available in 30+ languages List of languages [show] Type Software platform License Freeware, mostly open-source,[8] with a few proprietary[9] compo nents[10] Website www.java.com Java is a set of computer software and specifications developed by Sun Microsyst ems, later acquired by Oracle Corporation, that provides a system for developing application software and deploying it in a cross-platform computing environment . Java is used in a wide variety of computing platforms from embedded devices an d mobile phones to enterprise servers and supercomputers. While less common, Jav a applets run in secure, sandboxed environments to provide many features of nati ve applications and can be embedded in HTML pages. Writing in the Java programming language is the primary way to produce code that will be deployed as byte code in a Java Virtual Machine (JVM); byte code compil ers are also available for other languages, including Ada, JavaScript, Python, a nd Ruby.
    [Show full text]
  • Comparative Studies of Six Programming Languages
    Comparative Studies of Six Programming Languages Zakaria Alomari Oualid El Halimi Kaushik Sivaprasad Chitrang Pandit Concordia University Concordia University Concordia University Concordia University Montreal, Canada Montreal, Canada Montreal, Canada Montreal, Canada [email protected] [email protected] [email protected] [email protected] Abstract Comparison of programming languages is a common topic of discussion among software engineers. Multiple programming languages are designed, specified, and implemented every year in order to keep up with the changing programming paradigms, hardware evolution, etc. In this paper we present a comparative study between six programming languages: C++, PHP, C#, Java, Python, VB ; These languages are compared under the characteristics of reusability, reliability, portability, availability of compilers and tools, readability, efficiency, familiarity and expressiveness. 1. Introduction: Programming languages are fascinating and interesting field of study. Computer scientists tend to create new programming language. Thousand different languages have been created in the last few years. Some languages enjoy wide popularity and others introduce new features. Each language has its advantages and drawbacks. The present work provides a comparison of various properties, paradigms, and features used by a couple of popular programming languages: C++, PHP, C#, Java, Python, VB. With these variety of languages and their widespread use, software designer and programmers should to be aware
    [Show full text]
  • Introduction to Java File
    Object Oriented Programming – SCJ2153 Introduction to JAVA Programming Language Associate Prof. Dr. Norazah Yusof Origins of the Java Language • Java was created by Sun Microsystems team led by Patrick Naughton and James Gosling in 1991. • Originally named Oak (Gosling liked the look of an oak tree that was outside his window at Sun). • Later, renamed to Java - Java coffee • In 1995, Java is released as a core component of Sun Microsystems‘ Java platform. • Now Java is part of Oracle corporation. Java logo Duke the Java mascot 2 Origins of the Java Language (cont.) • The challenge: – Intended to design a small computer language that could be used for consumer devices/appliances such as the cable TV switchboxes. – It is a difficult task because these devices do not have a lot of power or memory, the language had to be small and generate very tight code. Also, because different manufacturers may choose different central processing units (CPUs), it was important that the language not be tied to any single architecture. 3 Origins of the Java Language (cont.) • The team developed a two-step translation process to simplify the task of compiler writing for each class of appliances – Program written in Java were translated into an intermediate language that is the same for all types of processors : Java byte-code – Then, the byte-code would be translated into the machine code for each processor 4 Origins of the Java Language (cont.) • In 1994, Patrick Naughton and Jonathan Payne at Sun Microsystems developed a Web browser that could run programs over the Internet • It then evolved into the HotJava browser.
    [Show full text]
  • Course Book M.Tech.(CSE) 2019-20
    Course Book M.Tech.(CSE) 2019-20 Computing Science and Engineering Computer Science and Engineering 2019-20 Curriculum Semester I Sl. Assessment Pattern Course Code Name of the Course No L T P C IA MTE ETE 1 CENG5001 Professional Communication Skills 0 0 2 1 50 - 50 Advanced Numerical and Statistical 2 MATH5001 3 1 0 4 20 50 100 Methods Advanced Design and Analysis of 3 MCSE1110 3 0 0 3 20 50 100 Algorithms 4 MCSE1120 Advanced Computer Networks 3 0 0 3 20 50 100 5 MCSE1130 Advanced Operating Systems 3 0 0 3 20 50 100 6 MCSE1150 Advanced Software Engineering 3 0 0 3 20 50 100 Advanced Design and Analysis of 7 MCSE1111 0 0 2 1 50 - 50 Algorithms Lab 8 MCSE1121 Advanced Computer Networks Lab 0 0 2 1 50 - 50 9 MCSE1151 Technical Seminar 0 0 2 1 50 - 50 Semester II Sl Assessment Pattern Course Code Name of the Course No L T P C IA MTE ETE 1 MCSE1240 Artificial Intelligence & Machine Learning 3 0 0 0 20 50 100 2 MCSE9100 Data Mining & Analytics using R 3 0 0 3 20 50 100 3 MCSE1260 Research Methodology 3 0 0 3 20 50 100 Foundations of Information Security 4 MCSE9260 3 0 0 3 20 50 100 (Elective-1) 5 MCSE1241 AI & ML using Python Lab 0 0 4 2 50 - 50 6 MCSE9101 Data Mining & Analytics using R Lab 0 0 4 2 50 - 50 7 MCSE1250 Python Programming 0 0 4 2 50 - 50 8 MCSE1251 Advanced Java Programming Lab 0 0 4 2 50 - 50 English Proficiency and Aptitude Building - 9 SLMC5012 0 0 2 1 50 - 50 2 10 MCSE1261 Certification Course/Term Paper 0 0 2 1 50 - 50 Semester III Sl Assessment Pattern Course Code Name of the Course No L T P C IA MTE ETE 1 MCSE2320 Software Project Management 3 0 0 3 20 50 100 2 Program Elective-2 3 0 0 3 20 50 100 3 Program Elective-3 3 0 0 3 20 50 100 Quantitative and Communication 4 SLMT5001 0 0 2 1 50 - 50 Proficiency 5 MCSE2321 Software Development Lab 0 0 4 2 50 - 50 6 MCSE2381 M.
    [Show full text]