Core Java Tutorial
2 likes249 views
This document provides an overview of Java, including where it is used, classes and objects in Java, a simple Java program, and how it compares to C++. Java is an object-oriented, platform-independent language used for desktop, web, enterprise, mobile, and embedded applications. A class defines common attributes and behaviors of objects. A Java program contains a main method that is the entry point and gets compiled into bytecode then machine code when executed. The main difference between Java and C++ is that Java is platform independent while C++ is platform dependent.
![java program
class Demo
{
public static void main(String args[])
{
System.out.println("Hello");
}
}](https://image.slidesharecdn.com/corejava-170808100237/85/Core-Java-Tutorial-7-320.jpg)
![Cont...
class: It is used to declare a class.
public:- It is access specifier. It makes the main
method visible to every where.
static: we don't have a need for any object to invoke
the main method.
void:- It is a return type. It means the main method
doesn't return any value.
String args[]: It is used for command line argument.](https://image.slidesharecdn.com/corejava-170808100237/85/Core-Java-Tutorial-8-320.jpg)
Core Java Tutorial
- 1. core java W W W . J A V A 2 B L O G . C O M
- 2. content Overview Where Java used Class Object Simple Java Program Program execution Java VS. C++
- 3. Overview Java is an High-level, object oriented and platform independent programming language. It was developed by James Gosling. There are 4 editions of Java 1. JavaSE (Java Standard Edition) 2. JavaEE (Java Enterprise Edition) 3. JavaME (Java Micro Edition) 4. JavaFX
- 4. Where Java used Java is used in many places: 1. Desktop application 2. Web application 3. Enterprise application 4. Mobile application 5. Embedded System 6. Robotics 7. Games
- 5. class a class is a collection of similar type of objects. It is a logical entity. It is a template which represents objects. class { data; methods; }
- 6. object An object is a real time entity that has state and behavior. It is a physical as well as a logical entity. For example, Pen is an object which has state (name, color, size) and behavior (writing).
- 7. java program class Demo { public static void main(String args[]) { System.out.println("Hello"); } }
- 8. Cont... class: It is used to declare a class. public:- It is access specifier. It makes the main method visible to every where. static: we don't have a need for any object to invoke the main method. void:- It is a return type. It means the main method doesn't return any value. String args[]: It is used for command line argument.
- 9. program execution Java source code is converted into byte code by Java compiler. Java byte code is converted into machine code. Compiler Interpreter Source Code Byte Code Byte Code Machine Code
- 10. Java Vs. C++ The main difference between Java and C++ is that Java is platform independent language and C++ is platform dependent language. Java doesn't support multiple inheritance, operator overloading, Explicit pointers, Structures, Union whereas C++ supports all these features.
- 11. thank you W W W . J A V A 2 B L O G . C O M