Java Variables - Variables in Java
Java Variables - Variables in Java
- 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
- To create a variable, you must specify the type and assign it a value:
Syntax
type variable name = “kaashiv”;- Where type is one of Java's types (such as int or String), and variableName is the name of the variable (such as x or name). The equal sign is used to assign values to the variable.
- To create a variable that should store text, look at the following example
Example
Create a variable called name of type String and assign it the value "kaashiv":
String name = “ kaashiv”
System.out.println(name);
Output
kaashiv
Final Variables
- If you don't want others (or yourself) to overwrite existing values, use the final keyword (this will declare the variable as "final" or "constant", which means unchangeable and read-only):
Example
final int myNum=15;
myNum=20//will generate an error:cannot assign a value to final variable