What is the default value of an uninitialized int variable in a Java class?
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In Java, the default value of an uninitialized int
variable depends on where it's declared. If an int
is declared as a member variable (also known as an instance variable) of a class and not explicitly initialized, it is automatically assigned the default value of 0
by the Java Virtual Machine (JVM). This is because Java ensures that all member variables of a class are given default values if they are not explicitly initialized.
In this case, myInt
is automatically initialized to 0
.
However, if you declare an int
variable inside a method (i.e. a local variable), Java does not assign it a default value. You must initialize it explicitly before using it, otherwise the code will not compile.
In summary:
-
Class-level
int
variables (fields): default to0
-
Local
int
variables (inside methods): no default value; must be explicitly initialized before use
This behavior ensures safety and predictability in class-level design while enforcing proper initialization in local scopes.
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