Java.io.RandomAccessFile.readInt() Method


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Description

The java.io.RandomAccessFile.readInt() method reads a signed 32-bit integer from this file. This method reads 4 bytes from the file, starting at the current file pointer.

Declaration

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

public final int readInt()

Parameters

NA

Return Value

This method returns the next four bytes of this file, interpreted as an int.

Exception

  • IOException − If an I/O error occurs.

  • EOFException − If this file reaches the end before reading four bytes.

Example

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

package com.tutorialspoint;

import java.io.*;

public class RandomAccessFileDemo {

   public static void main(String[] args) {
   
      try {
         int i = 284;
         
         // create a new RandomAccessFile with filename test
         RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

         // write something in the file
         raf.writeInt(123);

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

         // print the int
         System.out.println("" + raf.readInt());

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

         // write something in the file
         raf.writeInt(i);

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

         // print the int
         System.out.println("" + raf.readInt());
         
      } 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 −

123
284

java_io_randomaccessfile.htm

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