Java Data Types
Java Tutorial » Java Data Types
Example:
Data types are divided into two groups:
int my_Number = 27; // Integer
float my_Float_Number = 34.98f; // Floating point number
char my_Letter = 'E'; // Character
boolean my_Bool = false; // Boolean
String my_Text = "Tutorial"; // String
float my_Float_Number = 34.98f; // Floating point number
char my_Letter = 'E'; // Character
boolean my_Bool = false; // Boolean
String my_Text = "Tutorial"; // String
1. Primitive data types - includes: byte, int, short, float, double, long, boolean and char
2, Non-primitive data types - such as Classes, String and Arrays
Primitive Data Types
There are eight primitive data types in Java:
byte -1 byte - numbers from -128 to 127
short -2 bytes - numbers from -32,768 to 32,767
int - 4 bytes - numbers from -2,147,483,648 to 2,147,483,647
long - 8 bytes - numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
float - 4 bytes - fractional numbers - storing 6 to 7 decimal digits
double - 8 bytes - fractional numbers - for storing 15 decimal digits
boolean -1 bit - true or false values
char - 2 bytes - a single character/letter or ASCII values
Integer Types
Byte
The byte data type, how we told you, can store numbers from -128 to 127. We use this way to save memory when you are certain the value it is between or equal: -128 and 127
Example:
byte my_Number = 100;
System.out.println(my_Number);
System.out.println(my_Number);
Short
The short data type store numbers between or equal: -32768 to 32767:
Example:
short my_Number = 4855;
System.out.println(my_Number);
System.out.println(my_Number);
Int
The int data type can store numbers between or equal -2147483648 to 2147483647.
Example:
int my_Number = 485566763;
System.out.println(my_Number);
System.out.println(my_Number);
Long
The long data type can store numbers between or equal -9223372036854775808 to 9223372036854775807.
Example:
long my_Number = 23372036854775808L;
System.out.println(my_Number);
System.out.println(my_Number);
Note: you should end the value with "L":
Floating Point Types
We use a floating point type when you need a number with a decimal, as 7.98 or 2.71828182845( The mathematical constant e is a transcendental irrational number).
Float data type store fractional numbers btween 3.4e−038 to 3.4e+038.
Example:
float my_Number = 4.85f;
System.out.println(my_Number);
System.out.println(my_Number);
Note: you should end the value with "f"::
Double
Double data type store fractional numbers between 1.7e−308 to 1.7e+308.
Example:
double my_Number = 3.85d;
System.out.println(my_Number);
System.out.println(my_Number);
Note: you should end the value with "d":
Java Data Types, size, range, exercises, trable, oracle, sizes, bits, integer, hackerrank solution
Java Data Types - java
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