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Core java introduction

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Beenu Gautam

This document provides an introduction to core Java concepts. It outlines the agenda which includes an overview of object-oriented programming principles in Java, a brief history of Java, its properties and applications. It also describes key Java programming concepts such as data types, operators, naming conventions, and the Java API. The document explains Java runtime environments like the JVM and differences between the JRE and JDK. It concludes with a demonstration of Java programming.

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Core Java [An Introduction]
Presenter Saurav Ghosh Corporate Trainer/Technical Analyst MTA|MCP|MCTS|MCT|Certified Hadoop Developer 11+ Years of Experience in Corporate Training and Application Development
Agenda  Getting Started  OOPs & Java as an Object Oriented Language  Brief History  Properties of Java  Java naming conventions  Java API packages  Java data types  Java operators  Installation and configuration  First Java program
Procedural vs Object Oriented programming  Use of functions  Called  Independent code  Top - Down approach of programming  Use of methods  Applied  Dependent code  Bottom - Up approach of programming
Object Oriented Paradigm[OOP’s]  Data Hiding / Data Abstraction  Encapsulation  Classes & Objects  Inheritance  Dynamic Binding  Polymorphism  Message Passing Object Oriented Programming : is an area / field of OOP’s implementation
Object Oriented Language Categories Object Oriented  A program is a file  main() is a function  C++ Object Based  A program is a class or a module or an assembly  main() is a method  Java / .NET / Visual Basic
Brief History  Java was developed by James Ghosling, Patrick Naughton, Mike Sheridan at Sun Microsystems Inc. in 1991.  The initial name was Oak but it was renamed to Java in 1995.
Versions  Java 1.0 : initial launch  Java 1.1 : redefined AWT event handling, new library elements were added  Java 1.2 : Swing and Collection framework was added  Java 1.3 : No major changes  Java 1.4 : assert keyword added
Version 1.5 [J2SE 5]  Generics  Annotations  Autoboxing and Autounboxing  Formatted I/O  For each loop,etc.
Java SE 7  Now String can be used to control Switch statement.  Multi Catch Exception  try-with-resource statement  Binary Integer Literals  Underscore in numeric literals, etc.
Java SE 8  Lamda Expressions  New Collection Package java.util.stream to provide Stream API.  Enhanced Security  Nashorn Javascript Engine included  Parallel Array Sorting  The JDBC-ODBC Bridge has been removed etc.
Properties of Java  Truly / Fully Object Oriented  Compiled and Interpreted  Platform Independent  Robust & Extensible  Automatically garbage collected  Multi threaded programming
Applications of Java  Developing Desktop Applications  Web Applications like Linkedin.com, Snapdeal.com etc  Mobile Operating System like Android  Embedded Systems  Robotics and games etc
Java Virtual Machine [JVM]  Java virtual Machine(JVM) is a virtual Machine that provides runtime environment to execute java byte code.  JVM control execution of every Java program  It enables features such as automated exception handling, Garbage-collected heap  Manages and executes all threads simultaneously
JVM Architecture Class loader loads the Class for execution Stores pre-class structure as constant pool Heap is in which objects are allocated Local variables and partial results are store here. Each thread has a private JVM stack created when the thread is created Program register holds the address of JVM instruction currently being executed It contains all native used in application Execution engine controls the execute of instructions contained in the methods of the classes Native method interface gives an interface between java code and native code during execution
Java API [Java Native code Library] All java predefined classes are grouped into physical folders called packages. java.lang -> basic java programming classes java.io ->classes for input and output stream java.net ->networking and socket programming java.awt -> GUI programming java.sql -> database programming javax.swing -> advanced GUI programming , etc External API’s are also available in form of jar files which can be downloaded and used as per requirement
Java Runtime Environment [JRE]  provides the libraries, the Java Virtual Machine, and other components to run applets and applications written in the Java programming language  JRE does not contain tools and utilities such as compilers or debuggers for developing applets and applications
Java Development Kit [JDK]  The JDK also called Java Development Kit is a superset of the JRE, and contains everything that is in the JRE, plus tools such as the compilers and debuggers necessary for developing applets and applications  Tools like  javac -> java compiler  java -> java interpreter  appletviewer -> applet tester, etc
Java Data types Primitive Non-primitive  Integer  byte (1)  short (2)  int (4)  long (8)  Floating Point  float (4)  double (8)  Character  char (2)  Logical  boolean (1)  Classes  Arrays  Interface String is a class but is used as a data typ Typecasting: allowed for primitive data types only
Programming Components & its Naming Conventions  Keywords => lowercase always  Symbols => single character  Classes => only alphabets, initial letter of every word in uppercase  Methods => only alphabets, initial word in lowercase & initial letter for rest of the words in uppercase  Variable & References => all in lower case  Constants => all in uppercase syntax
Java Operators  Arithmetic +,-,/,*,%  Relational >,<,>=,<=,!=,==  Logical &&,||, !  Increment / Decrement ++,--  Bitwise &,|,^,<<,>>,>>>  Compound +=,-=,*=,/=,%=  Assignment =  Special Ternary, instanceof
Progamming Concepts …..  Variables & Constants  Evaluation & creating expression  Editors & it’s use  Java program structure
Demonstration follows…… Thank You

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Core java introduction

  • 1. Core Java [An Introduction]
  • 2. Presenter Saurav Ghosh Corporate Trainer/Technical Analyst MTA|MCP|MCTS|MCT|Certified Hadoop Developer 11+ Years of Experience in Corporate Training and Application Development
  • 3. Agenda  Getting Started  OOPs & Java as an Object Oriented Language  Brief History  Properties of Java  Java naming conventions  Java API packages  Java data types  Java operators  Installation and configuration  First Java program
  • 4. Procedural vs Object Oriented programming  Use of functions  Called  Independent code  Top - Down approach of programming  Use of methods  Applied  Dependent code  Bottom - Up approach of programming
  • 5. Object Oriented Paradigm[OOP’s]  Data Hiding / Data Abstraction  Encapsulation  Classes & Objects  Inheritance  Dynamic Binding  Polymorphism  Message Passing Object Oriented Programming : is an area / field of OOP’s implementation
  • 6. Object Oriented Language Categories Object Oriented  A program is a file  main() is a function  C++ Object Based  A program is a class or a module or an assembly  main() is a method  Java / .NET / Visual Basic
  • 7. Brief History  Java was developed by James Ghosling, Patrick Naughton, Mike Sheridan at Sun Microsystems Inc. in 1991.  The initial name was Oak but it was renamed to Java in 1995.
  • 8. Versions  Java 1.0 : initial launch  Java 1.1 : redefined AWT event handling, new library elements were added  Java 1.2 : Swing and Collection framework was added  Java 1.3 : No major changes  Java 1.4 : assert keyword added
  • 9. Version 1.5 [J2SE 5]  Generics  Annotations  Autoboxing and Autounboxing  Formatted I/O  For each loop,etc.
  • 10. Java SE 7  Now String can be used to control Switch statement.  Multi Catch Exception  try-with-resource statement  Binary Integer Literals  Underscore in numeric literals, etc.
  • 11. Java SE 8  Lamda Expressions  New Collection Package java.util.stream to provide Stream API.  Enhanced Security  Nashorn Javascript Engine included  Parallel Array Sorting  The JDBC-ODBC Bridge has been removed etc.
  • 12. Properties of Java  Truly / Fully Object Oriented  Compiled and Interpreted  Platform Independent  Robust & Extensible  Automatically garbage collected  Multi threaded programming
  • 13. Applications of Java  Developing Desktop Applications  Web Applications like Linkedin.com, Snapdeal.com etc  Mobile Operating System like Android  Embedded Systems  Robotics and games etc
  • 14. Java Virtual Machine [JVM]  Java virtual Machine(JVM) is a virtual Machine that provides runtime environment to execute java byte code.  JVM control execution of every Java program  It enables features such as automated exception handling, Garbage-collected heap  Manages and executes all threads simultaneously
  • 15. JVM Architecture Class loader loads the Class for execution Stores pre-class structure as constant pool Heap is in which objects are allocated Local variables and partial results are store here. Each thread has a private JVM stack created when the thread is created Program register holds the address of JVM instruction currently being executed It contains all native used in application Execution engine controls the execute of instructions contained in the methods of the classes Native method interface gives an interface between java code and native code during execution
  • 16. Java API [Java Native code Library] All java predefined classes are grouped into physical folders called packages. java.lang -> basic java programming classes java.io ->classes for input and output stream java.net ->networking and socket programming java.awt -> GUI programming java.sql -> database programming javax.swing -> advanced GUI programming , etc External API’s are also available in form of jar files which can be downloaded and used as per requirement
  • 17. Java Runtime Environment [JRE]  provides the libraries, the Java Virtual Machine, and other components to run applets and applications written in the Java programming language  JRE does not contain tools and utilities such as compilers or debuggers for developing applets and applications
  • 18. Java Development Kit [JDK]  The JDK also called Java Development Kit is a superset of the JRE, and contains everything that is in the JRE, plus tools such as the compilers and debuggers necessary for developing applets and applications  Tools like  javac -> java compiler  java -> java interpreter  appletviewer -> applet tester, etc
  • 19. Java Data types Primitive Non-primitive  Integer  byte (1)  short (2)  int (4)  long (8)  Floating Point  float (4)  double (8)  Character  char (2)  Logical  boolean (1)  Classes  Arrays  Interface String is a class but is used as a data typ Typecasting: allowed for primitive data types only
  • 20. Programming Components & its Naming Conventions  Keywords => lowercase always  Symbols => single character  Classes => only alphabets, initial letter of every word in uppercase  Methods => only alphabets, initial word in lowercase & initial letter for rest of the words in uppercase  Variable & References => all in lower case  Constants => all in uppercase syntax
  • 21. Java Operators  Arithmetic +,-,/,*,%  Relational >,<,>=,<=,!=,==  Logical &&,||, !  Increment / Decrement ++,--  Bitwise &,|,^,<<,>>,>>>  Compound +=,-=,*=,/=,%=  Assignment =  Special Ternary, instanceof
  • 22. Progamming Concepts …..  Variables & Constants  Evaluation & creating expression  Editors & it’s use  Java program structure