Java.io.RandomAccessFile.writeChars() Method

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Description

The java.io.RandomAccessFile.writeChars(String s) method writes a string to the file as a sequence of characters. Each character is written to the data output stream as if by the writeChar method. The write starts at the current position of the file pointer.

Declaration

Following is the declaration for java.io.RandomAccessFile.writeChars() method

public final void writeChars(String s)

Parameters

  • s -- a String value to be written.

Return Value

This method does not return a value.

Exception

  • IOException -- if an I/O error occurs.

Example

The following example shows the usage of java.io.RandomAccessFile.writeChar() method.

package com.tutorialspoint;

import java.io.*;

public class RandomAccessFileDemo {

   public static void main(String[] args) {
      try {
         String s = "Hello World";

         // create a new RandomAccessFile with filename test
         RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

         // write a char in the file
         raf.writeChars(s);

         // set the file pointer at 0 position
         raf.seek(0);

         // read chars
         for (int i = 0; i < 11; i++) {
            System.out.print("" + raf.readChar());
         }

         // set the file pointer at 0 position
         raf.seek(0);

         // change the line for better view
         System.out.println();

         // write a char at the start
         raf.writeChars("This is an example");

         // set the file pointer at 0 position
         raf.seek(0);

         // read chars
         for (int i = 0; i < 18; i++) {
            System.out.print("" + raf.readChar());
         }
      } catch (IOException ex) {
         ex.printStackTrace();
      }

   }
}

Assuming we have a text file c:/test.txt, which has the following content. This file will be used as an input for our example program:

ABCDE  

Let us compile and run the above program, this will produce the following result:

Hello World
This is an example



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