Core Java-1 (1).pdf
- 2. What is java? Java is a general-purpose, class-based, object-oriented programming language designed for having lesser implementation dependencies. It is a computing platform for application development. Java is fast, secure, and reliable, therefore. It is widely used for developing Java applications in laptops, data centers, game consoles, scientific supercomputers, cell phones, etc.
- 3. What is Java Platform? Java Platform is a collection of programs that help programmers to develop and run Java programming applications efficiently. It includes an execution engine, a compiler, and a set of libraries in it. It is a set of computer software and specifications. James Gosling developed the Java platform at Sun Microsystems, and the Oracle Corporation later acquired it.
- 4. What is Java used for? Here are some important Java applications: It is used for developing Android Apps Helps you to create Enterprise Software Wide range of Mobile Java Applications Scientific Computing Applications Use for Big Data Analytics Java Programming of Hardware devices Used for Server-Side Technologies like Apache, JBoss, GlassFish, etc.
- 5. History of Java Programming Language Here are important landmarks from the history of the Java language: The Java language was initially called OAK. Originally, it was developed for handling portable devices and set-top boxes. Oak was a massive failure. In 1995, Sun changed the name to “Java” and modified the language to take advantage of the burgeoning www (World Wide Web) development business. Later, in 2009, Oracle Corporation acquired Sun Microsystems and took ownership of three key Sun software assets: Java, MySQL, and Solaris.
- 6. It is one of the easy-to-use programming languages to learn. Write code once and run it on almost any computing platform. Java is platform-independent. Some programs developed in one machine can be executed in another machine. It is designed for building object-oriented applications. It is a multithreaded language with automatic memory management. It is created for the distributed environment of the Internet. Facilitates distributed computing as its network-centric. Java Features Here are some important Java features:
- 7. JDK is a software development environment used for making applets and Java applications. The full form of JDK is Java Development Kit. Java developers can use it on Windows, macOS, Solaris, and Linux. JDK helps them to code and run Java programs. It is possible to install more than one JDK version on the same computer. Java Development kit (JDK)
- 8. Java Virtual Machine (JVM) Java Virtual Machine (JVM) is an engine that provides a runtime environment to drive the Java Code or applications. It converts Java bytecode into machine language. JVM is a part of the Java Run Environment (JRE). In other programming languages, the compiler produces machine code for a particular system. However, the Java compiler produces code for a Virtual Machine known as Java Virtual Machine.
- 9. Java Runtime Environment (JRE) JRE is a piece of software that is designed to run other software. It contains the class libraries, loader class, and JVM. In simple terms, if you want to run a Java program, you need JRE. If you are not a programmer, you don’t need to install JDK, but just JRE to run Java programs.
- 10. JRE contains class libraries, JVM, and other supporting files. It does not include any tool for Java development like a debugger, compiler, etc. It uses important package classes like math, swing, util, lang, awt, and runtime libraries. If you have to run Java applets, then JRE must be installed in your system. Here are the main reasons of using JRE: Why use JRE?
- 11. There are four different types of Java programing language platforms: 1. Java Platform, Standard Edition (Java SE): Java SE’s API offers the Java programming language’s core functionality. It defines all the basis of type and object to high-level classes. It is used for networking, security, database access, graphical user interface (GUI) development, and XML parsing. 2. Java Platform, Enterprise Edition (Java EE): The Java EE platform offers an API and runtime environment for developing and running highly scalable, large-scale, multi-tiered, reliable, and secure network applications. 3. Java Programming Language Platform, Micro Edition (Java ME): The Java ME platform offers an API and a small- footprint virtual machine running Java programming language applications on small devices, like mobile phones. 4. Java FX: JavaFX is a platform for developing rich internet applications using a lightweight user-interface API. It user hardware-accelerated graphics and media engines that help Java take advantage of higher-performance clients and a modern look-and-feel and high-level APIs for connecting to networked data sources. Different Types of Java Platforms
- 12. Like the C compiler, the Java compiler does not produce native executable code for a particular machine. Instead, Java produces a unique format called bytecode. It executes according to the rules laid out in the virtual machine specification. Therefore, Java is a platform-independent language. Bytecode is understandable to any JVM installed on any OS. In short, the java source code can run on all operating systems. How is Java Platform Independent?
- 13. In computing, a compiler is a computer program that translates computer code written in one programming language into another language. The name "compiler" is primarily used for programs that translate source code from a high-level programming language to a lower-level language to create an executable program. what is compiler?
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