JAVA: Data Types Conversion Chart ~ JAVA INTERVIEW QUESTIONS

Saturday, 11 January 2014

JAVA: Data Types Conversion Chart

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In Java Programming Language, we must declare a variable name and type, before using it. The data type of a variable defines the the type of value it will contain. Java supports total 8 types of primitive data types. The name of this data types are all reserved as keywords.
Among which, 1) byte, 2) short, 3) int & 4) long can store integer values of different range.
5) float and 6) double can store floating numbers of different range.
7) boolean can store only true/false. It is used as flag, to perform boolean operation.
8) char can store a single 16-bit Unicode character of range from '\u0000' (0) to '\uffff' (65,535).
Apart from these, Java also provides a String data type which is defined as a Class (java.lang.String). It can contains alpha numeric values.

byte

Type: Integer (8-bit signed two's complement integer).
Range: from -128 [-2^(8-1)] to 127 [(2^(8-1))-1].
Memory: 1 byte
Default Value : 0
Example: byte b = 0;

short

Type: Integer (16-bit signed two's complement integer).
Range: from -32768 [-2^(16-1)] to 32767 [(2^(16-1))-1].
Memory: 2 bytes
Default Value : 0
Example: short s = 0;

int

Type: Integer (32-bit signed two's complement integer).
Range: from -2147483648 [-2^(32-1)] to 2147483647 [(2^(32-1))-1].
Memory: 4 bytes
Default Value : 0
Example: int i = 0;

long

Type: Integer (64-bit signed two's complement integer).
Range: from -9223372036854775808 [-2^(64-1)] to 9223372036854775807 [(2^(64-1))-1].
Memory: 8 bytes
Default Value : 0L
Example: long l = 0L;

float

Type: Float (Single precision 32-bit IEEE 754 floating point).
Range: from 1.4E-45F to 3.4028235E+38F.
Memory: 4 bytes
Default Value : 0.0f
Example: float f = 0f;

double

Type: Float (Single precision 64-bit IEEE 754 floating point).
Range: from 4.9E-324D to 1.7976931348623157E+308D.
Memory: 8 bytes
Default Value : 0.0d
Example: double d = 0d;

boolean

Type: boolean (boolean flag - true / false).
Range: NA.
Memory: virtual machine dependent
Default Value : false
Example: boolean b = false;

char

Type: Character (a single 16-bit Unicode character).
Range: from '\u0000' (0) to '\uffff' (65535).
Memory: 2 bytes
Default Value : '\u0000'
Example: char c = '\u0000';

String

Type: String Character (a class can store alpha numeric value).
Range: NA
Memory: NA
Default Value : null
Example: String s = "Hello World";

Anijit Sarkar

19 Responses to “ JAVA: Data Types Conversion Chart ”

Hardcoded said... 15 January 2014 at 20:05 You shouldn't use Boolean/Byte/Short/Integer/Long.valueOf(String) to get a (native) boolean/byte/... It's like calling: byte b = Byte.valueOf(Byte.parseBoolean(string));
Hardcoded said... 16 January 2014 at 14:51 The byte to String conversion doesn't convert the byte value to a String representation, it treats the byte as a character of the plattforms default charset. So this is most likely the wrong method to convert a byte to String
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