Random Access Files

Revised: Mar./16th/2002

What is "Random Access"?

$B:#$^$G07$C$F$-$?%9%H%j!<%`$O%7!<%1%s%7%c%k(B (sequential) $B$H8F$P$l$^$9!#$D$^$j!"F,$+$i=gHV$KFI$_9~$_!"=q$-9~$_$r9T$&$b$N$G$9!#(B

$B0lHL$K!"5-21G^BN$H$$$&$b$N$O(B$B%7!<%1%s%7%c%k%"%/%;%9(B (sequential access) $B$H(B$B%i%s%@%`%"%/%;%9(B (random access) $B$KJ,$1$i$l$^$9!#A0@\FI$_$K$$$+$l$k$3$H$,0[$J$j$^$9!#$b$A$m$s!"%V%m%C%/%G%P%$%9$b%7!<%1%s%7%c%k$K%"%/%;%9$9$k$3$H$b2DG=$G$9!#(B

$B%7!<%1%s%7%c%k!&%"%/%;%9!&%G%P%$%9(B (sequential access devise): $B%"%/%;%9%"!<%`$,!"%G%P%$%9$N8=:_0LCV$+$iA08e$X=gHV$K0\F0$9$k!#L\E*$N>l=j$X$O=g
$B%i%s%@%`!&%"%/%;%9!&%G%P%$%9(B (random access devise): $B%"%/%;%9%"!<%`$,!"l=j$XD>@\%"%/%;%9$G$-$k!#(B

$B%3%s%T%e!<%?$N%a%b%j!J%9%H%l!<%8!K$d<'5$%G%#%9%/!J%O!<%I%G%#%9%/!"%U%m%C%T!<%G%#%9%/!K$O%i%s%@%`%"%/%;%92DG=$J%G%P%$%9$NBeI=Nc$G$9!#Nc$($P!"%O!<%I%G%#%9%/$G$O!"(B$B%7%j%s%@!"%H%i%C%/!"%;%/%?(B (CTS) $B$r;XDj$7$?$j!"$=$N>pJs$r3JG<$7$?%"%m%1!<%7%g%s%F!<%V%k(B (File Allocation Table) $B$r;2>H$9$k$3$H$G!"BP1~$9$k5-21>l=j$^$G%"%/%;%9%"!<%`$rF0$+$7$F!"%@%$%l%/%H$KFI$_=q$-$9$k$3$H$,2DG=$G$9!#0lJ}!"0lIt$N%3%s%T%e!<%?$G8=:_$G$b%P%C%/%"%C%WMQES$J$I$G;H$o$l$F$$$k<'5$%F!<%W$O%7!<%1%s%7%c%k%"%/%;%9$7$+=PMh$J$$%G%P%$%9$NBeI=$G$9!#(B

$BF,$+$i=gHV$KFI$`$3$H$GL\E*$N%G!<%?$K9T$-Ev$?$k$H$$$&%5!<%A(B (seek) $BJ}K!$7$+$J$$%7!<%1%s%7%c%k%"%/%;%9$N%G%P%$%9$KBP$7$F!"L\E*$N%G!<%?$KD>@\%"%/%;%92DG=$J%i%s%@%`%"%/%;%9%G%P%$%9$O%7!<%/;~4V$,HtLvE*$KC;=L$7$^$9!#(B

What is "Random Access File" in Java?

Java $B$G$b!"%M%#%F%#%V$J%O!<%I%&%'%"$N%"%/%;%9FC@-$rMxMQ$9$k$3$H$,=PMh$^$9!#$D$^$j!"%O!<%I%G%#%9%/$J$I%i%s%@%`%"%/%;%92DG=$J%G%P%$%9>e$N%U%!%$%k%7%9%F%`$KBP$7$F$O!"%i%s%@%`%"%/%;%9$,2DG=$G$9!#6qBNE*$K$O!"DL>o$N%U%!%$%k$KBP$7$F!"G$0U$N0LCV$GFI$_=q$-$,2DG=$K$J$j$^$9!#(B

$B$b$A$m$s!"(B JavaVM $B>e$N%*%V%8%'%/%H$H$7$F%"%/%;%9$9$k$o$1$G$9$,!"%i%s%@%`%"%/%;%92DG=$J%*%V%8%'%/%H$r!"(B Random Access File $B$H8F$S$^$9!#(B

$BNc$($P!"(B ZIP $B$J$I$N%"!<%+%$%V$r9M$($F$_$^$7$g$&!#05=L%U%!%$%k$O!"B?$/$N05=L%9%-!<%`$G%G%#%l%/%H%j9=B$$r%5%]!<%H$7$F$$$^$9!#05=L%U%!%$%k$NCf$GFH<+$N%U%!%$%k%7%9%F%`$r;}$C$F$$$k$H1>$C$F$bNI$$$G$7$g$&!#$3$3$G$O%G%#%l%/%H%j9=B$$d$=$N%a%s%P!<$G$"$k%U%!%$%k$N>pJs$J$I$,5-:\$5$l$?%X%C%@>pJs$rMQ0U$7$^$9!#3F%U%!%$%k$4$H$K%X%C%@$r$D$1$F6rD>$K$D$J$.9g$o$;$?05=L%"%k%4%j%:%`$G$O!"%7!<%1%s%7%c%k$K%5!<%A$9$kB>L5$$$N$G%"%/%;%9B.EY$,0-$/$J$j$^$9$,!"%X%C%@>pJs$rF,$+KvHx$K$^$H$a$?>l9g$O!"$=$3$@$1$r%5!<%A$7$FL\E*$N%U%!%$%k$K%@%$%l%/%H$K%"%/%;%9$G$-$k$?$a!"%"%/%;%98zN($,NI$/$J$j$^$9!#(B

$B$3$N$h$&$J%X%C%@$,MQ0U$5$l$F$$$k>l9g$G$b!"%7!<%1%s%7%c%k$J%9%H%j!<%`$G$O%7!<%1%s%7%c%k$K$7$+%"%/%;%9$G$-$J$$$N$G!"L\E*$N%G!<%?$KE~C#$9$k$^$G$N%7!<%/%?%$%`$OC;$/$J$j$^$;$s!#%i%s%@%`%"%/%;%92DG=$J%9%H%j!<%`$J$i$P!"%X%C%@$N%5!<%A$N;~4V$@$1$GL\E*$N%G!<%?$KE~C#$G$-$k$N$G%7!<%/%?%$%`$,C;=L$5$l$^$9!#(B

$B$3$N$h$&$J!"(B Random Access File $B$rRandomAccessFile $B%/%i%9$G$9!#(B

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