Export Import Scenerio

Requirement
Export from schema userA with all objects and Import to Schema userBIt should replace the table t itself
expdp system/pass schemas=usera directory=DATA_PUMP_DIR dumpfile=myfile.dmp logfile=myfile.logimpdp system/pass REMAP_schema=usera:userb directory=DATA_PUMP_DIR dumpfile=myfile.dmp logfile=myfile.log TABLE_EXISTS_ACTION=REPLACE