The first program you write when learning a new programming language is called the Hello World program

When this program runs, it displays the following: Hello, World!

What does each term in the program refers to in simple words focusing on what it does not how it is works.

Java programs are made up of class and methods definitions.

A method is a named sequence of statements

A statement is a line of code that performs a basic action.

In the Hello World program, this line is a print statement that displays a message to the use:

System.out.println displays results on the screen.

The name println stands for print line. Like most statements, the print statement ends with a semicolon ;

Java is case-sensitive, which means that uppercase and lowercase are not the same.

A method is a named sequence of statements. This program defines one method named main

The name and format of main is special: when the program runs, it starts at the first statement in main and ends when it finishes the last statement.

This program defines a class named Hello

You can give a class any name you like but it is conventional to start with a capital letter

The name of the class has to match the name of the file it is in, so this class has to be in a file named Hello.java

Java uses curly braces ({ and }) to group things together.

In Hello.java, the outermost braces contain the class definition (represent by red), and the inner braces contain the method definition (represent by green )

The line that begins with two slashes (//) is a comment

Comments have no effect on the execution of the program, but they make it easier for other programmers (and your future self) to understand what you meant to do.

In next blog I will cover compiling java programs

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