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Data type in java

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In this section we will tell you about data type in java. A data type is defined as " type of data that can be stored in variable". Java is a statically-typed language that means before using the variable it must be declared.

Data type in java

In this section we will tell you about data type in java. A data type is defined as " type of data that can be stored in variable". Java is a statically-typed language that means before using the variable it must be declared. Declaring a variable includes type of variable and name of variable. By declaring the type of data, compiler restrict the user from assigning a wrong type of data to a variable.

int counter = 1;

By doing so, we are informing compiler that variable "counter" is holding the integer type of data, which has an initial value 1.

There are two data type in java.

  • Primitive Data type
  • Reference Data  type

Primitive Data type :

 Apart from int type there are seven other primitive data types in java programming language. Primitive means which is predefined by the language. 8 primitive data type are as follows:

byte : byte data type is a 8-bit signed two's compliment integer. It has minimum value of -128 and maximum value of 128. It is used when save space in large array.  Default value is 0.

short : short data type is 16-bit signed two's compliment integer. It has minimum value of -32768 and maximum value is +32767, it is used to save memory in large array. Default value is 0.

int : int data type is 32-bit signed two's compliment integer. It has minimum value of -2,147,483648 and maximum value is +2,147,483647, it is used to as default data type. Default value is 0.

long : long data type is 64-bit signed two's compliment integer. It has minimum value of -9,223,372,036,854,775,808 and maximum value is +9,223,372,036,854,775,807.Default values is 0, this data type is used when more than int range is required .

float : float data type is single precision 32-bit IEEE 754 floating point. float is mainly used to save memory in array and default value is 0.0f .

double : double data type is a double precision 64-bit IEEE 754 format. this data type is basically used as default data type for decimal. Default value is 0.0d.

boolean : boolean data type has only two possible values true and false. This data type is used for flag that retern true/false. Default value is false.

char : char data type is single 16-bit Unicode character. It has a minimum value of '\u0000' and maximum value of '\uffff'. char data type is used to store any character.

Reference Data type :

It is also called non-primitive or object type, which are used to access object type.

  • Class, array and interfaces are reference data type.

  • Default value of any reference variable is null.

  • A reference variable can be used to refer to any object of the declared type.

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    Posted on: May 10, 2013

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