Day 4: Java Variables

Variables are containers for storing data values.

In Java, there are different types of variables, for example:

String - stores text, such as "Hello". String values are surrounded by double quotes
int - stores integers (whole numbers), without decimals, such as 123 or -123
float - stores floating point numbers, with decimals, such as 19.99 or -19.99
char - stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes
boolean - stores values with two states: true or false

Declaring (Creating) Variables:

create a variable in Java, you need to:

Choose a type (like int or String)
Give the variable a name (like x, age, or name)
Optionally assign it a value using =

Syntax :

type variableName = value;
For example, if you want to store some text, you can use a String:

Example :

Create a variable called name of type String and assign it the value "John".
Then we use println() to print the name variable:

String name = "John";
System.out.println(name);

Example :

Create a variable called myNum of type int and assign it the value 15:

int myNum = 15;
System.out.println(myNum);

You can also declare a variable without assigning the value, and assign the value later:

Example
int myNum;
myNum = 15;
System.out.println(myNum);