Variables in JAVA Language

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Java Variables :

Variables store data for processing.

A variable is given a name (or identifier), such as area, age, height, and the like. The name uniquely identifies each variable, assigning a value to the variable and retrieving the value stored.

Variables have types. Some examples:

- int: for integers (whole numbers) such as 123 and -456

- double: for floating-point or real numbers with optional decimal points and fractional parts in fixed or scientific notations, such as 3.1416, -55.66.

- String: for texts such as "Hello" or "Good Morning!". Text strings are enclosed within double quotes.

You can declare a variable of a type and assign it a value. Example:

String name = "David";

This creates a variable called name of type String, and assigns it the value "David".

Examples of variable declarations:

class MyClass {
    public static void main(String[ ] args) {
        String name ="David";
        int age = 42;
        double score =15.9;
        char group = 'Z';
    }
}

char stands for character and holds a single character.

Another type is the Boolean type, which has only two possible values: true and false.
This data type is used for simple flags that track true/false conditions.
For example:

boolean online = true;

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