Java is a popular programming language.

Java is used to develop mobile apps, web apps, desktop apps, games and much more.

Java was developed in 1995. by ( James Gosling, Mike Sheridan, and Patrick Naughton at Sun Microsystems.)

How does Java work?

• Compilation:

  • the source code (the code that we write) is stored as a .java file and is sent to the compiler which is stored in JDK(Java Development Kit) and is converted into Byte code (stored as a .class file)

• Execution:

  • now, JVM(Java Virtual Machine) takes the byte code and makes it a native code
  • and this native code can run on any OS as long as it has JRE(Java Runtime Environment). which comes in JDK.
    • hence JAVA is a portable coding language as it can stored and shared on different OS.

• command line bhosda

  public class ClassName{
  	public static void main(String[] args){ #can be anything, its just a variable
  		int n = Intger.parseInterger(args[0]);
  		sout(n);
  }
  

  $ javac ClassName.java # compiling the file
  $ java ClassName args[0] args[1] "arg [2]"