An example is provided called Hello.java :




public class Hello {
  public static void main(String[] args) {
  System.out.println("Hello World!");



;
, Remember: If you place a variable in the main class, you can reference it anywhere. Choose the type of variable you need.


Integer data types : Used to store integer values like 3, 4, -34 etc

byte
short
int
long


Floating Point data type : Used to store numbers having fractional part like 3.479

float
double


Character data type: Used to store characters like 's', 'r', 'g', 'f' etc

char


Boolean data types : Can store either of the two values: true and false

boolean


Reference data types : Used to store references to objects

Array types
Object types like String



, Here are examples of how to create and assign a value to each type.


int someNumber = 0;






double someDouble = 635.29;






float someDecimal = 4.43f;






boolean trueFalse = true;






String someSentence = "My dog ate a toy";






char someChar = 'f';







, It is basically "type name = value".



final int someNumber = 35; Adding the 'final' here means that the variable 'someNumber' cannot be changed later
Create a simple Java program.
Scroll to a place where you want to insert the variable.
Create the variable.
Understand how this works.
Protect variables from being edited later, optionally, by adding "final type name" between the parentheses in the second line of your code (public static void main).
{"src": "wikihow-all_validation", "title": "How to Create a Variable in Java"}