What is java?-Saurabh Upadhyay
Download as PPTX, PDF0 likes40 views
The document provides an overview of the Java programming language. It discusses that Java is a popular programming language created in 1995, owned by Oracle, and used to develop mobile, desktop, web and server-side applications. It also describes why Java is widely used, common Java concepts like variables and operators, object-oriented programming principles in Java, and threading and polymorphism in Java.
What is java?-Saurabh Upadhyay
- 1. SAURABH UPADHYAY presented what is java ?
- 2. What is Java? JAVA IS A POPULAR PROGRAMMING LANGUAGE, CREATED IN 1995. IT IS OWNED BY ORACLE, AND MORE THAN 3 BILLION DEVICES RUN JAVA. IT IS USED FOR: MOBILE APPLICATIONS (SPECIALLY ANDROID APPS) DESKTOP APPLICATIONS WEB APPLICATIONS WEB SERVERS AND APPLICATION SERVERS GAMES DATABASE CONNECTION AND MUCH, MUCH MORE!
- 3. Why Use Java? Java works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc.) It is one of the most popular programming language in the world It is easy to learn and simple to use It is open-source and free It is secure, fast and powerful It has a huge community support (tens of millions of developers) Java is an object oriented language which gives a clear structure to programs and allows code to be reused, lowering development costs As Java is close to C++ and C#, it makes it easy for programmers to switch to Java or vice versa.
- 4. Java Variables Variables are containers for storing data values. In Java, there are different types of variables, for example: String- stores text, such as "Hello". String values are surrounded by double quotes Int- stores integers (whole numbers), without decimals, such as 123 or -123 Float-stores floating point numbers, with decimals, such as 19.99 or -19.99 Char-stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes Boolean- stores values with two states: true or false
- 5. Software Development Life Cycle (SDLC) SDLC is a process that creates a structure of development of software. There are different phases within SDLC, and each phase has its own different activity. It makes development team able to design, create and deliver a high-quality product. SDLC describes various phases of software development and the order of execution of phases. Each phase requires deliverable from the previous phase in a life cycle of software development. Requirements are translated into design, design into development and development into testing, after testing it is given to the client.
- 6. Different phases of the software development cycle Requirement Phase Design Phase Build /Development Phase Testing Phase Deployment/ Deliver Phase Maintenance
- 7. Multithreading in Java Multithreading is a Java feature that allows concurrent execution of two or more parts of a program for maximum utilization of CPU. Each part of such program is called a thread. So, threads are light-weight processes within a process. Threads can be created by using two mechanisms : 1. Extending the Thread class 2. Implementing the Runnable Interface. Thread creation by extending the Thread class We create a class that extends the java.lang.Thread class. This class overrides the run() method available in the Thread class. A thread begins its life inside run() method. We create an object of our new class and call start() method to start the execution of a thread. Start() invokes the run() method on the Thread object.
- 8. Java Operators Java divides the operators into the following groups: Arithmetic operators Assignment operators Comparison operators Logical operators Bitwise operators
- 9. Java OOP OOP stands for Object-Oriented Programming. Procedural programming is about writing procedures or methods that perform operations on the data, while object-oriented programming is about creating objects that contain both data and methods. Object-oriented programming has several advantages over procedural programming: OOP is faster and easier to execute OOP provides a clear structure for the programs OOP helps to keep the Java code DRY "Don't Repeat Yourself", and makes the code easier to maintain, modify and debug OOP makes it possible to create full reusable applications with less code and shorter development time
- 10. Java - What are Classes and Objects? class Car objects Volvo Audi Toyota
- 11. Java Polymorphism Polymorphism means "many forms", and it occurs when we have many classes that are related to each other by inheritance. Like we specified in the previous chapter; Inheritance lets us inherit attributes and methods from another class. Polymorphism uses those methods to perform different tasks. This allows us to perform a single action in different ways. For example, think of a superclass called Animal that has a method called animalSound(). Subclasses of Animals could be Pigs, Cats, Dogs, Birds - And they also have their own implementation of an animal sound (the pig oinks, and the cat meows, etc.):