Java Write To File - Java Tutorial

Ads
 

Java Write To File - Java Tutorial

In the section of Java Tutorial you will learn how to write java program to write to a file.

In the section of Java Tutorial you will learn how to write java program to write to a file.

For writing data to a file, the class FileWriter and BufferedWriter are used.

 FileWriter :

 FileWriter is a subclass of OutputStreamWriter class that is used to write text (as opposed to binary data) to a file. You create a FileWriter by specifying the file to be written to, or optionally, when the data should be appended to the end of an existing file instead of overwriting that file. The FileWriter class creates an internal FileOutputStream to write bytes to the specified file

BufferedWriter :

The BufferedWriter class is used to write text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays and strings. 
The constructor of the
FileWriter class takes the file name which has to be buffered by the BufferedWriter stream. The write( ) method of BufferedWriter class is used to create the file into specified directory.

Following code  write data into new file: 

out.write(read_the_Buffered_file_name);

Following code creates the object of FileWriter and BufferedWriter

FileWriter fstream = new FileWriter(file_name);
BufferedWriter out = new BufferedWriter(fstream);

Lets see an another example that writes the text input by the user using the FileWriter and the BufferedWriter class.

import java.io.*;

public class FileWriter{

  public static void main(String[] argsthrows IOException{
  BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
  System.out.print("Please enter the file name to create : ");
  String file_name = in.readLine();
  File file = new File(file_name);
  boolean exist = file.createNewFile();
  if (!exist)
  {
  System.out.println("File already exists.");
  System.exit(0);
  }
  else
  {
  FileWriter fstream = new FileWriter(file_name);
  BufferedWriter out = new BufferedWriter(fstream);
  out.write(in.readLine());
  out.close();
  System.out.println("File created successfully.");
  }
  }
}

Output of the Program 

C:\nisha>javac CreateFile.java

C:\nisha>java CreateFile
Please enter the file name to create : nishu.txt
this is my name
File created successfully.

C:\nisha>

 Download the code

Ads

Ads