Default initial values for Java unassigned variables

Source: Internet
Author: User

In a Java program, any variable must be initialized before it can be used. When an object is created, the instance variable is assigned a value by the programmer-specified initialization value when allocating memory space, or the system is initialized by the following default values:

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

Note: A reference with a null value of "NULL" does not refer to any object. Attempting to use the object it references will cause an exception.

Default initial values for Java unassigned variables

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