Tammet – 19. september 2005, kell 10:00

2005-09-19T10:00:19Z

Uus lehekülg

<pre>
// Vaike demo failist ridade kaupa lugemise kohta,
// mis lihtsalt kopeerib faili.
//
// NB! Vt teisi naiteid Ecki opik sektsioon 10.3
//
// Olulist tahele panna:
// - Programm loeb kasurealt sisendfaili ja valjundfaili nimed
// - Valjundfaili kirjutatakse read, tapselt nagu sisendist loetud
// - Kui valjundfail oli varem juba olemas, siis programm ei tee koopiat ja peatub.
// - Rea kaupa lugemiseks kasutab BufferedReader klassist funktsiooni readLine
// - Trykkimiseks kasutatav println on sama, mis System.out jaoks println, ainult
// et valjund laheb avatud faili, mis on System.out asemel.
// - Avatud failid tuleb peale nende kasutamist sulgeda

// Must import java.io.* in order to get access to libraries

import java.io.*;

public class ioproov {

public static void main(String[] args) {

String sourceName;
String copyName;

/* Get two file names from the command line.
If the command line does not have a legal form,
print an error message and end this program. */

if (args.length == 2) {
sourceName = args[0];
copyName = args[1];
}
else {
System.out.println("Usage: java ioproov <source-file> <copy-name>");
return;
}

/* If the output file already exists,
print an error message and end the program. */

File file = new File(copyName);
if (file.exists()) {
System.out.println("Output file exists. Exiting.");
return;
}

// All file I/O operations must be done within a try/catch statement

try {

// Set up the proper readers and writers
FileReader file_reader = new FileReader(sourceName);
FileWriter file_writer = new FileWriter(copyName);
BufferedReader br_reader = new BufferedReader(file_reader);
PrintWriter pr_writer = new PrintWriter(file_writer);

// Get the first line of the file
String line = br_reader.readLine();

// check to see if it is null - end of file
while (line != null) {

// print line to output file
pr_writer.println(line);

// get next line of input file
line = br_reader.readLine();

} // while loop

// Finally you must close input and output streams!

file_reader.close();
file_writer.close();

} //try

// catch any exceptions thrown
catch (IOException e) {
//print error and exit program
System.out.println(e);
System.exit(1);
}
}
}
</pre>

Ioproov.java - Redigeerimiste ajalugu

Tammet – 19. september 2005, kell 10:00