Change Schema OWNER of ALL Objects in 10gR2 ?

Folks  

How can the Schema OWNER of ALL Objects Owned by (say) OWNER1 be Changed to OWNER2 in 10gR2?

NOTE - OWNER2 does NOT exist in the Database.

NOTE - Other / multiple schemas & respective Objects should remain unaffected.

NOTE - Database is a Testing Database. Hence Downtime is NOT an issue.  

Qs Is Export , Import the the only way using 1 of the following?  

exp - OWNER=OWNER1 / imp - FROMUSER=OWNER1, TOUSER=OWNER2 ,

expdp - SCHEMAS=OWNER1 / impdp - REMAP_SCHEMA=OWNER1:OWNER2  

Cheers  

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