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Java -lec-1
Java is an object-oriented programming language that is platform independent. It compiles to bytecode that runs on a Java Virtual Machine (JVM) available for most operating systems. Key features of Java include being object-oriented, compiled and interpreted, platform independent, distributed, multi-threaded, dynamic, and robust/secure. The Java Development Kit (JDK) includes tools like compilers while the Java Runtime Environment (JRE) contains libraries and the JVM needed to run Java applications. Integrated development environments (IDEs) provide tools to write and test Java code.
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Java -lec-1
- 1. JAVA "WRITE ONCE, RUNANYWHERE” Lec--1 By: Zubair Khalid
- 2. £ What isJava? £ Features of Java? £ Why it is platform independent? £ What is JVM, JDK, JRE, IDE? Java
- 3. £ Java isa programming language and platform £ Released by sun microsystems in 1995 £ Lot of applications and websites don’t work until you have installed java £ Java is fast, secure & reliable What is Java
- 4. 1) Object Oriented 2)Compiled & Interpreted 3) Platform independent & portable 4) Distributed (java.net package for developing N/W Applications) 5) Multi-threaded (java.lanq package contains thread class) 6) Dynamic (C, C++ Native methods can be used) 7) Robust & Secure Features of Java
- 5. £ Platform =hardware + operating system E.G.: Dell + windows 8.1 £ In case of C or C++ (which are not platform independent) compiler generate the .Exe file that is OS dependent so when we run this .Exe file on another OS it will not run because this file is OS dependent What is Platform Independence?
- 6. JAVA COMPILATION AND EXECUTION ₪Each OS has separate JVM to read Bytecode in its own way. ₪ Means that JVM depends on OS. ₪ If it does not, then there should be only one JVM block in picture that would be leading to every OS. Java Code (.java) JAVA Compile r Byte Code (.Class) JVM JVM JVM Windows Linux Mac How Java is Platform Independent (OS Independent)
- 7. £ Stands forjava runtime environment £ Implementation of JVM £ Physically exists £ Set of libraries + other files Set of libraries E.g. rt.jarJVM Other files What is JRE?
- 8. £ Stands forjava development kit £ Full featured SDK for java £ Includes JRE + compilers + tools £ Set of libraries + other files What is JDK? Set of libraries E.g. rt.jarJVM Other files Development Tools. E.g. Javac.java etc. JRE
- 9. Inside JVM Machine Code (0101001) JAVA Interpret er ByteCode (.Class) What is JVM? Converts Byte Code into real Machine code
- 10. Description of Java(Conceptual Diagram)
- 11. What is IDE? £Stands for integrated development environment £ Provides basic tools for writing and testing £ Consists of £ Code Editor £ Compiler or Interpreter £ Debugger
- 12. Java IDE £ Someof most famous Java IDE’s are following £ Eclipse £ NetBeans £ Android Studio