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Update README.md #1

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19 changes: 18 additions & 1 deletion 2. Basic Syntax/README.md
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Expand Up @@ -32,5 +32,22 @@ Hello World
* <b>Program File Name</b> - Name of the program file should exactly match the class name.
<br><b>Example:</b> Assume 'MyFirstJavaProgram' is the class name. Then the file should be saved as 'MyFirstJavaProgram.java'
* <b>public static void main(String args[])/b> - Java program processing starts from the main() method which is a mandatory part of every Java program.

### Java Identifiers
All Java components require names. Names used for classes, variables, and methods are called identifiers.

Source: [tutorialspoint](https://www.tutorialspoint.com/java/java_basic_syntax.htm)2
In Java, there are several points to remember about identifiers. They are as follows −

* All identifiers should begin with a letter (A to Z or a to z), currency character ($) or an underscore (_).

* After the first character, identifiers can have any combination of characters.

* A key word cannot be used as an identifier.

* Most importantly, identifiers are case sensitive.

* Examples of legal identifiers: age, $salary, _value, __1_value.

* Examples of illegal identifiers: 123abc, -salary.

Source: [tutorialspoint](https://www.tutorialspoint.com/java/java_basic_syntax.htm)2