Java IO Tutorial - Java RandomAccessFile.readDouble()

Syntax

RandomAccessFile.readDouble() has the following syntax.

public final double readDouble()   throws IOException

Example

In the following code shows how to use RandomAccessFile.readDouble() method.

/* w  w w  . jav a2 s  .c o m*/

import java.io.*;

public class Main {

   public static void main(String[] args) {
      try {
         double d = 1.2345678;
         
         RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

         raf.writeDouble(123.456789);

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

         System.out.println(raf.readDouble());

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

         // write a double at the start
         raf.writeDouble(d);

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

         // read double
         System.out.println(raf.readDouble());
         raf.close();
      } catch (IOException ex) {
         ex.printStackTrace();
      }

   }
}