Data type

In computer science and computer programming, a data type or simply type is a classification of data which tells the compiler or interpreter how the programmer intends to use the data. Most programming languages support various types of data, for example: real, integer or Boolean.

A data type provides a set of values from which an expression may take its values. The type defines the operations that can be done on the data, the meaning of the data, and the way values of that type can be stored.

The Java programming language is statically-typed, which means that all variables must first be declared before they can be used. This involves stating the variable's type and name.

int gear = 1;

Java programming language supports seven other primitive data types. A primitive type is predefined by the language and is named by a reserved keyword. Primitive values do not share state with other primitive values. The eight primitive data types supported by the Java programming language are:

The Java Primitive Data Types and Default Values

Data TypeDefault Value (for fields
byte0
short0
int0
long0L
float0.0f
double0.0d
booleanfalse
char'\u0000'

In addition to the eight primitive data types listed above, the Java programming language also provides special support for character strings via the java.lang.String class. Enclosing your character string within double quotes will automatically create a new String object;

Note:For example:

String s = "this is a string";

String objects are immutable, which means that once created, their values cannot be changed. The String class is not technically a primitive data type, but considering the special support given to it by the language, you'll probably tend to think of it as such. You'll learn more about the String class in Simple Data Objects

Data TypeDefault Value (for fields
String (or any object)null

Local variables are slightly different; the compiler never assigns a default value to an uninitialized local variable. If you cannot initialize your local variable where it is declared, make sure to assign it a value before you attempt to use it. Accessing an uninitialized local variable will result in a compile-time error.

byte
short
int
long
float
double
boolean
char

References : wikipedia oracle share on :        :  

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