How to Create a Variable in Java

Step-by-Step Guide

1. 1

   Step 1: Create a simple Java program.

   An example is provided called Hello.java : public class Hello { public static void main(String[] args) { System.out.println("Hello World!");
2. 2

   Step 2: Scroll to a place where you want to insert the variable.

   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'
3. 3

   Step 3: Create the variable.

   It is basically "type name = value". , final int someNumber = 35; Adding the 'final' here means that the variable 'someNumber' cannot be changed later
4. 4

   Step 4: Understand how this works.

5. 5

   Step 5: Protect variables from being edited later

6. 6

   Step 6: optionally

7. 7

   Step 7: by adding "final type name" between the parentheses in the second line of your code (public static void main).

Detailed Guide

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