Java --- 24 --- basic data type object packaging class, java judges object type

Java --- 24 --- basic data type object packaging class, java judges object type

Basic Data Type object Packaging

Byte Byte

Short

Int Integer

Boolean Boolean

Float Float

Double Double

Char Character

 

The most common function of the basic data type object packaging class is to convert between the basic data type and the string type.

 

Convert basic data type to string

Basic Data Type + ""

Basic data type. toString (Basic Data Type value)

Example: Integer. toString (34); // convert 34 to "34"

Convert string to Data Type

Xxx a = Xxx. parseXxx (String );

Int a = Integer. parseInt ("123 ");

Double B = Double. parseDouble (12.12121 ");