The difference between member variables and local variables

The difference between member variables and local variables:

1. Different positions in the class

Member variables: in the class, outside the method

Local variables: in In the method definition or method declaration

2. The location in the memory is different:

Member variables: in the heap memory

Local variables: in the stack memory

3. Different life cycles:

Member variables: exist with the creation of the object, and disappear with the disappearance of the object

Local variables: exist with the call of the method , disappears as the method call is completed

4. Different initialization values

Member variables: have default initialization values

Local variables: no default initialization values, must be defined, Assign a value before it can be used.

Note:

The local variable name can be the same as the member variable name. When used in a method, the proximity principle is adopted.

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