• Every line of code in Java must be inside a class
• A class should always start with an uppercase letter
• Java is case-sensitive
• The name of Java file must match the class name
• Save the file with .java in the end

Main

• The main is required :

  public static void main(String args[])
  

• Every program contains a main

System.out.println()

• Used inside the main method

public static void main(String[] args){
   System.out.println("Hello World");
}

[!Note]

• The curly braces {} marks the beginning of and end block of the code

• System is a built-in Java class containing members like out for ‘output’

• The println() known as print-line

• Each code should end with a semi-colon ;

println()

• Used to output or print text
• When using text we should use double-quotes ""

• Adds a new-line after every output making it more systematic to read

• System.out.println(“Say it..”)
• ==System.out.println(This will produce an error !)

print()

• Here it does not insert a new-line after every output

System.out.print("Hello");