JAVA: Data Types Conversion Chart ~ JAVA INTERVIEW QUESTIONS

Saturday 11 January 2014

JAVA: Data Types Conversion Chart

Do you like this Article?

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;