#Basic data types in lists java code#

Prefix 0 is used to indicate octal, and prefix 0x indicates hexadecimal when using these number systems for literals. For example −īyte, int, long, and short can be expressed in decimal(base 10), hexadecimal(base 16) or octal(base 8) number systems as well. Literals can be assigned to any primitive type variable.

#Basic data types in lists java code#

They are represented directly in the code without any computation. For example, Employee, Puppy, etc.Ĭlass objects and various type of array variables come under reference datatype.ĭefault value of any reference variable is null.Ī reference variable can be used to refer any object of the declared type or any compatible type.Įxample: Animal animal = new Animal('giraffe') Ī literal is a source code representation of a fixed value. These variables are declared to be of a specific type that cannot be changed. Reference variables are created using defined constructors of the classes. ('Float: ' + floatResult) ĭouble doubleResult = doubleValue1 + doubleValue2 ('Long: ' + longResult) įloat floatResult = floatValue1 + floatValue2 Long longResult = longValue1 + longValue2 Short shortResult = (short)(shortValue1 + shortValue2) We've used add operations on numeric data types whereas boolean and char variables are printed as such.īyte byteResult = (byte)(byteValue1 + byteValue2) Maximum value is '' (or 65,535 inclusive)Ĭhar data type is used to store any characterįollowing examples shows the usage of variour primitive data types we've discussed above. This data type is used for simple flags that track true/false conditionsĬhar data type is a single 16-bit Unicode character There are only two possible values: true and false This data type is generally used as the default data type for decimal values, generally the default choiceĭouble data type should never be used for precise values such as currencyīoolean data type represents one bit of information Example − long a = 100000L, long b = -200000Lįloat data type is a single-precision 32-bit IEEE 754 floating pointįloat is mainly used to save memory in large arrays of floating point numbersįloat data type is never used for precise values such as currencyĭouble data type is a double-precision 64-bit IEEE 754 floating point.This type is used when a wider range than int is needed.Long data type is a 64-bit signed two's complement integer.Integer is generally used as the default data type for integral values unless there is a concern about memory.Įxample − int a = 100000, int b = -200000

Int data type is a 32-bit signed two's complement integer. A short is 2 times smaller than an integerĮxample − short s = 10000, short r = -20000 Short data type can also be used to save memory as byte data type. Short data type is a 16-bit signed two's complement integer byteīyte data type is an 8-bit signed two's complement integerīyte data type is used to save space in large arrays, mainly in place of integers, since a byte is four times smaller than an integer. Let us now look into the eight primitive data types in detail. Primitive datatypes are predefined by the language and named by a keyword. There are eight primitive datatypes supported by Java. There are two data types available in Java − Therefore, by assigning different data types to variables, you can store integers, decimals, or characters in these variables. This means that when you create a variable you reserve some space in the memory.īased on the data type of a variable, the operating system allocates memory and decides what can be stored in the reserved memory. Variables are nothing but reserved memory locations to store values.