On the difference between static variable, member variable and local variable _java

The difference between a static variable and a member variable:

A: Belong to different

Static variables: Belong to class, class variable

Member variables: objects, object variables, instance variables

B: Different memory locations

Static variables: Static area of method area

Member variables: Heap memory

C: Different life cycles

Static variables: Static variables are loaded as classes are loaded, disappearing as classes disappear

Member variables: member variables exist as objects are created and disappear as objects disappear

D: Calling different

Static variables: Can be invoked by object name, or by class name

Member variables: Only called by object name

The difference between a member variable and a local variable:

A: The position in the class is different

Member variables: Outside of methods in a class

Local variables: In the method definition or the method declaration

B: In-memory locations are different

Member variables: in heap memory

Local variables: in stack memory

C: Different life cycles

Member variables: exist as objects are created and disappear as objects disappear

Local variable: exists as a method call and disappears as the method is called

D: Different initialization values

Member variable: has default initialization value

Local variables: There is no default initialization value, you must define, assign, and then use.

Precautions :

Local variable names can be the same as member variable names, when used in a method, using the proximity principle.

The above is a small series for everyone to talk about static variables, member variables, local variables, the difference of all the contents of the three, I hope to help you, a lot of support cloud Habitat Community ~