What's the life span of a variable in a program (in Java)?

Question

Can you tell me how long a variable lives in a program (in Java). i.e. variables declared inside methods, variables used in parameters, STATIC variables, variables used to return from a method, etc.

Thanks.

Answer 1

1. Variables declared inside methods go out of scope when the method exits.
2. Parameters won't be eligible for GC until there are no more references to them or they go out of scope.
3. Static variable are associated with a class and live as long as the class is loaded.
4. Return values won't be eligible for GC until there are no more references to them or they go out of scope.

Answer 2

Objects in Java are guaranteed to live as long as they are referenceable through a transitive closure of the root set. This is a conservative approximation of the application's live objects¹.

Edit: Is this question concerning object lifetime, or variable scope? We have some mixed terminology going on.

¹ A live object is an object that will be referenced again before the application terminates.