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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 TypeSizeValue Range
Byte1 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));


Addition of 3 numbers are : 60


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