Revised: May/5th/2002; Since: Jan./5th/2002
$B%U%!%$%k$KBP$9$k%9%H%j!<%`$O!"
$B%F%-%9%H!&%U%!%$%k(B |
FileReader FileWriter
|
---|---|
$B%P%$%J%j!&%U%!%$%k(B |
FileInputStream FileOutputStream
|
$B$3$l$i$N%/%i%9$G$O!"(B JavaVM $B$,F0:n$7$F$$$k%M%$%F%#%V$J%U%!%$%k%7%9%F%`>e$K$"$k%U%!%$%k$KBP$9$k%9%H%j!<%`$r:n$j$^$9!#$3$N%U%!%$%k$O!"(B File
$B%/%i%9$d(B FileDescriptor
$B%/%i%9$N%*%V%8%'%/%H$H$7$F;2>H$7$^$9!#(B
$B7Q>54X78!'(B
java.io.FileReader |
java.io.FileWriter |
---|---|
java.lang.Object | +--java.io.Reader | +--java.io.InputStreamReader | +--java.io.FileReader | java.lang.Object | +--java.io.Writer | +--java.io.OutputStreamWriter | +--java.io.FileWriter |
$B%3%s%9%H%i%/%?!'(B
FileReader(File file) FileReader(FileDescriptor fd) FileReader(String fileName) FileWriter(File file) FileWriter(FileDescriptor fd) FileWriter(String fileName) FileWriter(String fileName, boolean append)
FileWriter
$B$N>l9g$O!"=q$-9~$_;~$K%U%!%$%k$KDI2C$9$k$N$+!"?75,$K=q$-9~$`$N$+$rBhFs0z?t$G;XDj$G$-$^$9!#0z?t$,0l$D$N>l9g$O%U%!%$%k$N@hF,$+$i?75,=q$-9~$_$H$J$j!"4{B8$N%G!<%?$O<:$o$l$^$9!#>\:Y$O(B API $B;EMM=q$r;2>H$/$@$5$$!#(B
$B7Q>54X78!'(B
java.io.FileInputStream |
java.io.FileOutputStream |
---|---|
java.lang.Object | +--java.io.InputStream | +--java.io.FileInputStream | java.lang.Object | +--java.io.OutputStream | +--java.io.FileOutputStream |
$B%3%s%9%H%i%/%?!'(B
FileInputStream(File file) FileInputStream(FileDescriptor fdObj) FileInputStream(String name) FileOutputStream(File file) FileOutputStream(FileDescriptor fdObj) FileOutputStream(String name) FileOutputStream(String name, boolean append)
FileOutputStream
$B$N>l9g$O!"=q$-9~$_;~$K%U%!%$%k$KDI2C$9$k$N$+!"?75,$K=q$-9~$`$N$+$rBhFs0z?t$G;XDj$G$-$^$9!#0z?t$,0l$D$N>l9g$O%U%!%$%k$N@hF,$+$i?75,=q$-9~$_$H$J$j!"4{B8$N%G!<%?$O<:$o$l$^$9!#>\:Y$O(B API $B;EMM=q$r;2>H$/$@$5$$!#(B
$B:G=i$KJ8;z%9%H%j!<%`$r;H$C$F$_$^$7$g$&!#Cm0U$9$Y$-$3$H$O!"
CCopy.java
:
import java.io.*; class CCopy { public static void main(String[] args) { try { //$B%U%!%$%k%*%V%8%'%/%H$N:n@.(B File iFile = new File(args[0]); File oFile = new File(args[1]); //$BJ8;z%9%H%j!<%`$N:n@.(B FileReader in = new FileReader(iFile); FileWriter out = new FileWriter(oFile); //$BFI$_9~$_$H=q$-9~$_(B int c; while ((c = in.read()) != -1) { out.write(c); } //$B%9%H%j!<%`$rJD$8$k(B in.close(); out.close(); System.out.println("$B%3%T!<=*N;!#(B"); } catch (IOException e) { System.out.println("$BF~=PNONc30$,H/@8!#(B"); System.out.println(e); } } }
$B%3%^%s%I%i%$%s$NBh0l0z?t$+$i(B File
$B%*%V%8%'%/%H$r$D$/$j!"$=$3$X(B FileReader
$B%9%H%j!<%`$r:n$C$F$$$^$9!#F1$8$/!"BhFs$N0z?t$+$i$b(B File
$B%*%V%8%'%/%H$r:n$C$F!"(B FileWriter
$B%9%H%j!<%`$r:n$C$F$$$^$9!#(B
c = in.read()
$B$O!"%*%V%8%'%/%H(B in
$B$+$i0lJ8;zFI$_9~$_!"(B c
$B$KBeF~$7$F$$$^$9!#%U%!%$%k$,=*N;$9$k(B (EOF: EndOfFile) $B$J$I!"FI$_9~$a$J$1$l$P(B -1
$B$,JV$j$^$9!#(B
out.write(c)
$B$O!"%*%V%8%'%/%H(B out
$B$K!"J8;z(B c
$B$r=PNO$7$F$$$^$9!#(B
$BFI$_9~$`%U%!%$%k$,B8:_$7$J$$>l9g$O!"(B$BNc30(B java.io.FileNotFoundException
$B$,H/@8$7$^$9!#B>$K$bNc30$,H/@8$9$k2DG=@-$N$"$k%a%=%C%I$,;H$o$l$F$$$k$N$G!"$=$l$i$N%9!<%Q!<%/%i%9$G$"$k(B java.io.IOException
$B7?$G%-%c%C%A$7$F$$$^$9!#99$K$=$N%9!<%Q!<%/%i%9$G$"$k(B java.lang.Exception
$B7?$G%-%c%C%A$7$F$bNI$$$G$7$g$&!#$$$:$l$K$;$h!"$3$N7?$NNc30$O(B$B%-%c%C%A(B$B$,I,?\$G$9!#99$K>e$N@)8f$X(B$B%9%m!<(B$B$7$F$bNI$$$G$7$g$&!#(B
$Btest.txt $B$,B8:_$7$F$$$?>l9g$N$b$N$G$9!#%3%^%s%I%i%$%s0z?t$K!"FI$_9~$_%U%!%$%k$H=q$-9~$_%U%!%$%k$r;XDj$7$^$9!#(B
C:\IO>javac CCopy.java C:\IO>java CCopy test.txt test_c.txt $B%3%T!<=*N;!#(B C:\IO>
$B $B2hA|!?2;@<$J$I$N%P%$%J%j%U%!%$%k$N>l9g$O!"%P%$%H%9%H%j!<%`(B $B$3$N%/%i%9$r(B $BJ8;z%9%H%j!<%`$N%5%s%W%k(B $B$3$3$G$O!"Nc30$r%-%c%C%A$7$J$$$G!"99$K>e$N@)8f$X%9%m!<$7$F$7$^$C$F$$$^$9!#(B$B%P%$%H%9%H%j!<%`$N%5%s%W%k(B
FileInputStream
/FileOutputStream
$B$r;H$$$^$9!#>e$N%5%s%W%k$N%9%H%j!<%`$NItJ,$r
//$B%P%$%H%9%H%j!<%`$N:n@.(B
FileInputStream in = new FileInputStream(iFile);
FileOutputStream out = new FileOutputStream(oFile);
BCopy.java
$B$H$7$F:n@.$7$^$9!#F1$8%G%#%l%/%H%j$K(B NEXTindex.gif
$B$,B8:_$7$?>l9g$N
C:\IO>javac BCopy.java
C:\IO>java BCopy NEXTindex.gif copy.gif
$B%3%T!<=*N;!#(B
C:\IO>
$B%5%s%W%k(B
CCopy.java
$B$r>/$7=$@5$7$F!"%3%T!<$9$k$@$1$G$O$J$/!"3F9T$4$H$K9THV9f$rDI2C$7$F=PNO$9$k$h$&$KJQ$($F$_$^$7$g$&!'(BNl.java
:
import java.io.*;
public class Nl {
public static void main(String[] args) throws IOException {
//$B%U%!%$%kL>$N%$%s%9%?%s%92=(B
File inputFile = new File(args[0]);
File outputFile = new File(args[1]);
//$BF~=PNO%9%H%j!<%`$N%$%s%9%?%s%92=(B
FileReader in = new FileReader(inputFile);
FileWriter out = new FileWriter(outputFile);
int c;
int i=1;
out.write(i+": ");
while ((c = in.read()) != -1) {
out.write(c);
if (c == '\n') {
i++;
out.write(i + ": ");
}
}
in.close();
out.close();
System.out.println("$B%3%T!<=*N;!#(B");
}
}
\n
$B$O2~9T$rI=$7$^$9!#FI$_9~$s$@J8;z$,2~9TJ8;z$J$i$P!"$=$N
C:\IO>javac Nl.java
C:\IO>java Nl test.txt nltest.txt
$B%3%T!<=*N;(B
C:\IO>
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