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Srilakhsmi v k
Files
2 Answer(s)      5 years and 6 months ago
Posted in : Java Beginners



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March 12, 2009 at 8:16 PM


use exists() method from File to find if the file already exists then write to the file:

String str = "this is test"; // or read from the command line
File file = new File("test.txt");
BufferedWriter bw;
if(file.exists()){ // check whether the file already exists, if true just append to the file otherwise create new one
bw = new BufferedWriter(new FileWriter(file,true));
bw.newLine();
} else {
bw = new BufferedWriter(new FileWriter(file));
}
bw.write(str);


I hope this will help you.

Thanks,
AJ


March 19, 2009 at 1:11 AM


hi friend


This code will works fine.


import java.io.*;
class FileWrite
{
public static void main(String args[])
{
try{
File file = new File("Hello.txt");
if(file.exists()){

FileWriter fstream = new FileWriter(file,true);
BufferedWriter out = new BufferedWriter(fstream);
out.write("Welcome");
out.newLine();
out.close();
}
else{
System.out.println("File does not exist");
}
}catch (Exception e){
System.err.println("Error: " + e.getMessage());
}
}
}

Thanks
RoseIndia Team


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