Introduction ● files OLong-term storage of large amounts of data PErsistent data exists after termination of program O Files stored on secondary storage devices Magnetic disks ● Optical disks Magnetic tapes O Sequential and random access files Introduction to Java Programming, revised by Dai-kaiyuLiang,Introduction to Java Programming,revised by Dai-kaiyu 3 Introduction ⚫Files Long-term storage of large amounts of data Persistent data exists after termination of program Files stored on secondary storage devices ⚫Magnetic disks ⚫Optical disks ⚫Magnetic tapes Sequential and random access files