Primitive number data types

Introduzione a Java

Jim White

Java Developer

Primitive types

Table summarizing primitive types - byte, short, int, long, float, double, char, and boolean

Numerical primitive types

byte, short, int, long, float, and double all highlighted as the focus for this video

Primitives for whole numbers - int

int stores whole numbers up to two million

long, short, and byte

Table summarizing long (up to a quintillion), short (up to 30000), and byte (up to 128)

int is the primitive of choice

int is used most of the time

double

double allows up to 16 decimal places

float

float stores up to 7 decimal places

double is the primitive for decimal numbers

double is used more often

Declaring primitives - int

defining int intEx = 123456

Declaring primitives - int, double, short, byte

Defining double, short, and byte variables in the same way

Declaring primitives - float and long

Syntax for float and long requires a F/f or L/l at the end

Numerical primitives in action

class PrintlnAsCalculator {
  public static void main(String[] args) {

    int x = 60000;
    byte y = 1;
    short z = 300;
    long w = 20000000L;

    System.out.println(x + y + z + w);
  } 
}

20060301

class PrintlnAsCalculator {
  public static void main(String[] args) {

    double pi = 3.1415926535;
    float half = 0.5F;

    System.out.println(pi + half);
  }
}

3.6415926535

Let's practice!

Introduzione a Java