How to draw multiple lines on same panel??

hiya
i would like to know how can I draw multiple lines on the same panel ?? I have already use repaint(); but it just come out the lastest line (say line 3) i draw .......those previous lines(say line 1 and 2) are disappear ........
Thanks for your help mate

http://www.java2s.com/ExampleCode/2D-Graphics/Line.htm

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DATA : IT_BDCDATA LIKE BDCDATA OCCURS 0 WITH HEADER LINE.
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DATA : V_EBELP(30) , V_MENGE(30) , V_WERKS(30), V_EMATN(30) ,
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data element: EKORG
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HEADER_LENGTH                 = 0
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DAT_MODE                      = ' '
CODEPAGE                      = ' '
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REPLACEMENT                   = '#'
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FILELENGTH                    =
HEADER                        =
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   FILE_OPEN_ERROR               = 1
   FILE_READ_ERROR               = 2
   NO_BATCH                      = 3
   GUI_REFUSE_FILETRANSFER       = 4
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   BAD_DATA_FORMAT               = 8
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   SEPARATOR_NOT_ALLOWED         = 10
   HEADER_TOO_LONG               = 11
   UNKNOWN_DP_ERROR              = 12
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   DISK_FULL                     = 15
   DP_TIMEOUT                    = 16
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