Numbers

Integer Types

Byte

The byte data type has a range from -128 to 127, allowing it to store whole numbers within this range. It can serve as an alternative to int or other integer types, particularly when memory conservation is a concern and you’re confident the value will fall within -128 and 127.

Example

byte myNum = 100;
System.out.println(myNum);

Short

The short data type encompasses whole numbers within the range of -32768 to 32767.

Example

short myNum = 5000;
System.out.println(myNum);

Int

The int data type accommodates whole numbers ranging from -2147483648 to 2147483647. Typically, and as emphasized in our tutorial, the int data type is the preferred choice for creating variables with numeric values.

Example

int myNum = 100000;
System.out.println(myNum);

Long

The long data type encompasses whole numbers spanning from -9223372036854775808 to 9223372036854775807. It is employed when the range of int is insufficient to accommodate the value. It’s noteworthy to append the value with an “L”.

Example

long myNum = 15000000000L;
System.out.println(myNum); 

Floating Point Types

Whenever a number with a decimal point, such as 9.99 or 3.14515, is required, it’s advisable to utilize a floating-point type.

Both the float and double data types are suitable for storing fractional numbers. Remember to append the value with “f” for floats and “d” for doubles.

Float Example

float myNum = 5.75f;
System.out.println(myNum);

Double Example

double myNum = 19.99d;
System.out.println(myNum);

float f1 = 35e3f;
double d1 = 12E4d;
System.out.println(f1);
System.out.println(d1)