Java.io.RandomAccessFile.setLength() Method

---

---

Description

The java.io.RandomAccessFile.setLength(long newLength) method sets the length of this file.

Declaration

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

public void setLength(long newLength)

Parameters

newLength − The desired length of the file

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.setLength() method.

package com.tutorialspoint;

import java.io.*;

public class RandomAccessFileDemo {
   public static void main(String[] args) {
   
      try {
         // create a new RandomAccessFile with filename test
         RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

         // write something in the file
         raf.writeUTF("Hello World");

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

         // print the string
         System.out.println("" + raf.readUTF());

         // print current length
         System.out.println("" + raf.length());

         // set the file length to 30
         raf.setLength(30);

         // print the new length
         System.out.println("" + raf.length());
         
      } 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
13
30