Java hello world program

Java

The requirement
for Java Hello World Example

Java “Hello, World!” Program

Compiling "Hello World" program :

How Java “Hello World!”
Program Works?

Parameters used in
Java “Hello World” Program

Java Class

Java Access Specifier: Public

Java Static

Java Void

Java Main Method

Valid java main method
signature

Invalid java main method
signature

Java Method Parameter: String[ ] args

System.out.println()

How
to resolve the error “javac is not recognized as an internal or external
command”?

Conclusion

Things to take away

  • Every valid Java Application must have a class definition (that
    matches the filename).

  • The main method must be inside the class definition.

  • The compiler executes the codes starting from the main
    function.