In this article History of Java we give the information about the Java language was created in 1991 by James Gosling and his team at Sun Microsystems. It is used to develop advanced and secure applications, websites, mobile applications and desktop applications etc.
Introduction to Java:-
Java is a programming language used for software development. It is used to develop advanced and secure applications, websites, mobile applications and desktop applications etc. This programming language is of high level which uses the principles of Object-Oriented Programming. This makes it a language that can be used for a wide variety of tasks.
Software developed by Java requires a Java Virtual Machine to operate. Java virtual machine is a software that systematically interprets Java code so that it can run on all platforms without any problem.
In Java, source code is compiled into byte code, whereas in other languages, source code is compiled into machine code.
History of Java:
The Java language was created in 1991 by James Gosling and his team at Sun Microsystems. This team is also called Green Team which included James Gosling, Mike Sheridan, and Patrick Naughton. All of them work in Sun Microsystem.
Sun Microsystem used to make software for its clients, but they had to do different coding to run the same software on different machines, in view of which they thought of creating Java language. Which is platform independent and can be easily run on any platform.
Java language was developed as a project to create a language for digital devices like set-top boxes, televisions.
Nowadays, Java is used for making internet programming, mobile devices, games etc.
Java is the most popular and widely used programming language in the world today. Java is a portable, secure and robust, programming language.
The Java language was developed as a project in June 1991 by a team working at Sun Microsystem called Green Team.
The real name of Java was Oak. Oak is a symbol of strength and it was also a national tree in many countries like U.S.A., France, Germany, Romania.
At that time, a company with the name Oak was already registered, so there was discussion about changing its name, but it was not possible to decide on a name, then one day when the Oak team was sitting where they were drinking coffee, there was Indonation coffee which was indonescence. Coffee was made from a substance called java, hence it was named java.
In 1995, its name was changed from Oak to Java. The first version of Java (Java 1.0) was publicly released in 1995.
Java Version History:-
| Java Versions | Release Date |
| JDK Alpha and Beta | 1995 |
| JDK 1.0 | 23rd Jan 1996 |
| JDK 1.1 | 19th Feb 1997 |
| J2SE 1.2 | 8th Dec 1998 |
| J2SE 1.3 | 8th May 2000 |
| J2SE 1.4 | 6th Feb 2002 |
| J2SE 5.0 | 30th Sep 2004 |
| Java SE 6 | 11th Dec 2006 |
| Java SE 7 | 28th July 2011 |
| Java SE 8 | 18th Mar 2014 |
| Java SE 9 | 21st Sep 2017 |
| Java SE 10 | 20th Mar 2018 |
| JAVA SE 11 | 25th Sep 2018 |
| JAVA SE 12 | 19th Mar 2019 |
| JAVA SE 13 | 17th Sep 2019 |
| JAVA SE 14 | 17th Mar 2020 |
| JAVA SE 15 | 15th Sep 2020 |
| JAVA SE 16 | 16th March 2021 |
| JAVA SE 17 | September 2021 |
| JAVA SE 18 | March 2022 |
| JAVA SE 19 | September 2022 |
| JAVA SE 20 | March 2023 |
| JAVA SE 21 | September 2023 |
Simple Program in java:
class Hello
{
public static void main(String []args)
{
System.out.println(“Have a nice Day!”);
}
}
Output:
Have a nice Day!
// public static void main(String []args) – In detail Explanation
| Part | Meaning |
| public | This means the method is accessible from anywhere (even outside the class). JVM needs to access it, so it must be public. |
| static | This means the method belongs to the class, not an object. So JVM can run it without creating an object of the class. |
| void | This means the method does not return any value. |
| main | This is the name of the method where the program starts. JVM looks for this name. |
| String[] args |
This is an array of strings. It stores any command-line arguments you pass while running the program. |
// System.out.println(…); In details Explanation
System.out.println is used in Java to print a message or value to the console, followed by a new line.
| Part | Meaning |
| System | A built-in class in the java.lang package. |
| out | A static object of PrintStream class inside System. It represents standard output (the screen). |
| println(…) | A method of PrintStream class that prints the message and then moves the cursor to a new line. |
// Addition of two numbers using Scanner Class
import java.util.Scanner; // Imports the Scanner class.
public class AddTwoNumbers
{
public static void main(String[] args)
{
// Create Scanner object to read input
Scanner input = new Scanner(System.in); // Creates a scanner object to read input from the keyboard.
// Ask user to enter first number
System.out.print(“Enter the first number: “);
int num1 = input.nextInt(); // Read first number
// Ask user to enter second number
System.out.print(“Enter the second number: “);
int num2 = input.nextInt(); // Read second number
// Calculate sum
int sum = num1 + num2;
// Display result
System.out.println(“The sum of ” + num1 + ” and ” + num2 + ” is: ” + sum);
// Close the scanner
input.close();
}
}
OutPut:
Enter the first number: 10
Enter the second number: 20
The sum of 10 and 20 is: 30
// Scanner input = new Scanner(System.in); — Explanation in Detail:
This line is used to create a Scanner object in Java that allows the program to read user input from the keyboard (console).
| Part | Meaning |
| Scanner | This is a class in Java (from java.util package) used for input. |
| input | This is the object name (you can name it anything). |
| new Scanner(…) | This creates a new Scanner object. |
| System.in | This is the standard input stream, which means keyboard input. |
The Scanner object (input) can now use methods like:
- nextInt() – to read an integer
- nextDouble() – to read a decimal number
- nextLine() – to read a full line
- next() – to read a single word
Some More:
POP- Introduction to Programming Using ‘C’
OOP – Object Oriented Programming
DBMS – Database Management System
RDBMS – Relational Database Management System
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