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
short
Anijit Sarkar
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
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9 Responses to “ JAVA: Data Types Conversion Chart ”
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));
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
19 August 2015 at 18:11
Very useful...
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24 October 2016 at 14:58
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