EspañolFrom time to time I find myself searching online for the ranges of the data types in whichever programming language I happen to be using.
It is important to choose the adequate data type for our variables depending on what we’re going to store.
If we’re just thinking on storing a number between 1 and 10, it would be a waste of memory to declare the variable as int.
The table below shows the primitive data types available in Java, for your reference.
| Type | Description | Bytes | Range | Default value |
| byte | Very short integer | 1 | -128 to 127 | 0 |
| short | Short integer | 2 | -32,768 to 32,767 | 0 |
| int | Integer | 4 | -2,147,483,648 to 2,147,483,647 | 0 |
| long | Long integer | 8 | -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 | 0L |
| float | Single-precision, floating-point number with up to 7 significant digits | 4 | +/-1.4E-45 (+/-1.4 times 10-45) to +/-3.4E38 (+/-3.4 times 1038 | 0.0f |
| double | Double-precision, floating-point number with up to 16 significant digits | 8 | +/-4.9E-324 (+/-4.9 times 10-324) to +/-1.7E308 (+/-1.7 times 10308) | 0.0d |
| char | Unicode character | 2 | \u0000 to \uFFFF | ‘\u0000’ |
| boolean | True or False value | 1 | true or false | false |
Examples
public class Example {
public static void main(String[] args) {
//declare variables
byte month = 12;
int counter = 0;
double pi = 3.1415926535897932384626433832795;
float rate = 4.25e2F;
char letter = 'Z';
boolean found = true;
//print values
System.out.println(month); //will print 12
System.out.println(counter); //will print 0
System.out.println(pi); //will print 3.141592653589793
System.out.println(rate); //will print 425.0
System.out.println(letter); //will print Z
System.out.println(found); //will print true
}
}