Initialization and default values in Java, wrapper classes and basic types

when a variable is used as a member of a class, Java ensures that its initial value is given to prevent program run-time Errors

Data Type	Initial value
Byte	0
Short	0
Int	0
Long	0L
Char	' u0000 '
Float	0.0f
Double	0
Boolean	False
All reference types	Null

Wrapper classes for basic data types are reference types

Basic type	Size (bytes)	Default value	Encapsulation class
Byte	1	(byte) 0	Byte
Short	2	(short) 0	Short
Int	4	0	Integer
Long	8	0L	Long
Float	4	0.0f	Float
Double	8	0.0d	Double
Boolean	-	False	Boolean
Char	2	\u0000 (NULL)	Character

If one side is a wrapper class, the other side is the basic type, or use the <, >, <= and other comparators, the value comparison will be done, if it is found that both sides are objects, it will directly compare the reference, not the value

Initialization and default values in Java, wrapper classes and basic types