Java Data Types
Data types in Java fall under the following categories :
1. Primitive Data Types (Intrinsic)
2. Non-Primitive Data Types (Derived)
Primitive Data Types
Java is statically typed, i.e., variables must be declared before use. Java supports 8 primitive data types:
| Data Type | Size | Value Range |
|---|---|---|
| Byte | 1 byte | -128 to 127 |
| short | 1 byte | -32,768 to 32,767 |
| int | 2 byte | -2,147,483,648 to 2,147,483,647 |
| float | 4 byte | 3.40282347 x 1038 to 1.40239846 x 10-45 |
| long | 8 byte | -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |
| double | 8 byte | 1.7976931348623157 x 10308, 4.9406564584124654 x 10-324 |
| char | 2 byte | 0 to 65,535 |
| boolean | Depends on JVM | True or False |
How to choose data types for our variables
In order to choose the data type, we first need to find the type of data we want to store. After that, we need to analyze the min & max value we might use.
Adding 3 number variables
public class Main {
public static void main(String[] args) {
int num1 = 10, num2 = 20, num3 = 30;
System.out.println("Addition of 3 numbers are :" + (num1+num2+num3));
}
}Output
Addition of 3 numbers are : 60