JAVA TUTORIAL PART 3 - DATA TYPES AND COMMENTS

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Data Types in Java

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1) Primitive Data Types

- These are the most basic data types in Java. They represent single values and are not objects.
There are different primitive data types - 

a) Integer Types- 

    - byte - 8-bit signed integer. Range varies from -128 to 127

    - short - 16-bit signed integer. Range varies from -32,768 to 32,767 

    - int - 32-bit signed integer. Range varies from -2^31 to 2^31-1

                    Example -         int num = 10;

    - long- 64-bit signed integer. Range varies from -2^63 to 2^63-1

b) Floating-Point types:

    - float - 32-bit floating-point number. It should be suffixed with 'f' or 'F'

    - double - 64-bit floating-point number. 

                    Example -         double pi = 3.14;

c) Other Primitive types:

    - char - 16-bit Unicode character.

                    Example -         char letter = 'H';

    - boolean - Represents the two values - true and false

                    Example -          boolean flag = true;

2) Reference Data Types

- These are used to refer to objects. They do not store the actual data but store the reference (Memory Address) of the object.

There are different reference data types - 

a) Class types- 

    - String - Represent a sequence of characters.

                    Example -         String text = "Hello";

b) Array types- 

    - Arrays - Ordered collection of elements of the same type.

c) Interface types- 

    - Interfaces - Defines a set of methods that a class must implement.

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Comments in Java

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Single-Line comments start with //

Multi-Line comments starts with /* and ends with */

Example- 

// This is a single-line comment /*  *  This is a multi-line comment *  This is the second multi-line comment. */