Tablespace vs user login

Hi, I am a java developer trying to understand Oracle. Here is my simple question:
In oracle each login/user is associated with a tablespace (default) after login. My understanding is that this tablespace serves as the schema name for the db access. So after login, the java code doesn't need to (can't) specify the schema name, only the table name.
What if my login(connection) need to use multiple tablespaces, how can I switch it without use a new connection? Or can a user be associated with multiple tablespaces?
Thanks, please give me some hints.

A schema and a user are very closely related things. Barring some corner cases (like enterprise users), you're probably safe in considering them the same thing. When you created the user "User1", you created a schema "User1".
If you want User2 to be able to access objects in User1's schema, User1 would need to
GRANT SELECT ON t1 TO User2User2 could then do
SELECT * FROM User1.t1You could also create a synonym for User1.t1 so that User2 didn't have to prefix the schema name. Or User2 could do
ALTER SESSION SET current_schema = User1and then
SELECT * FROM t1would select from the T1 table in the User1 schema.
A tablespace is just a logical collection of objects that simplifies a DBA's job of managing physical allocation. It is entirely possible for one user to have different objects in different tablespaces and for one tablespace to have objects owned by multiple users. A DBA can move objects between tablespaces essentially transparently to the application or the application owner.
Justin

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