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12.10 A Basic InputStreamOutputStream Example
The following example uses the FileInputStream and the FileOutputStream class to read from a specified file and copies the content of this file to another file.
import java.io.; class CopyFile {
void copyString input, String output { FileInputStream inputStr;
FileOutputStream outputStr; int data;
try { inputStr = new FileInputStreaminput;
outputStr = new FileOutputStreamoutput; while data = inputStr.read = -1 {
outputStr.writedata; }
inputStr.close; outputStr.close;
} catch IOException ie { ie.printStackTrace;
} }
public static void mainString args[] { String inputFile = args[0];
String outputFile = args[1]; CopyFile cf = new CopyFile;
cf.copyinputFile, outputFile; }
}
Passing tempo.txt and tempo2.txt as arguments, heres a sample run of this code:
Figure 12.3: Sample output for CopyFile
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12.11 Modified InputStreamOutputStream Example
The next example is uses the PushbackInputStream class that decorates a FileInputStream object and the PrintStream class.
import java.io.; class CopyFile {
void copyString input { PushbackInputStream inputStr;
PrintStream outputStr; int data;
try { inputStr = new PushbackInputStreamnew
FileInputStreaminput; outputStr = new PrintStreamSystem.out;
while data = inputStr.read = -1 { outputStr.printlnread data: + char data;
inputStr.unreaddata; data = inputStr.read;
outputStr.printlnunread data: + char data; }
inputStr.close; outputStr.close;
} catch IOException ie { ie.printStackTrace;
} }
public static void mainString args[] { String inputFile = args[0];
CopyFile cf = new CopyFile; cf.copyinputFile;
} }
Test this code on a file containing a few lines or characters. Say, we have a file named tempo.txt containing the following text:
one 1 two
Passing tempo.txt to the code generates the following output: read data: o
unread data: o read data: n
unread data: n read data: e
unread data: e read data:
unread data: read data: 1
unread data: 1 read data:
unread data: read data:
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unread data: read data: t
unread data: t read data: w
unread data: w read data: o
unread data: o
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12.12 Serialization
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