Java.io.DataInputStream.readDouble() Method

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Description

The java.io.DataInputStream.readDouble() method reads 8 bytes and returns one double value.

Declaration

Following is the declaration for java.io.DataInputStream.readDouble() method:

public final double readDouble()

Parameters

  • NA

Return Value

This method returns 8 bytes of input stream, interpreted as double.

Exception

  • IOException -- if an I/O error occurs or the stream has been closed.

  • EOFException -- if the stream reaches the end.

Example

The following example shows the usage of java.io.DataInputStream.readDouble() method.

package com.tutorialspoint;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class DataInputStreamDemo {
   public static void main(String[] args) throws IOException {
      
      InputStream is = null;
      DataInputStream dis = null;
      FileOutputStream fos = null;
      DataOutputStream dos = null;
      double[] dbuf = {65.56,66.89,67.98,68.82,69.55,70.37};
      
      try{
         // create file output stream
         fos = new FileOutputStream("c:\\test.txt");
         
         // create data output stream
         dos = new DataOutputStream(fos);
         
         // for each byte in the buffer
         for (double d:dbuf)
         {
            // write double to the data output stream
            dos.writeDouble(d);         
         }
         
         // force bytes to the underlying stream
         dos.flush();
         
         // create file input stream
         is = new FileInputStream("c:\\test.txt");
         
         // create new data input stream
         dis = new DataInputStream(is);
         
         // read till end of the stream
         while(dis.available()>0)
         {
            // read character
            double c = dis.readDouble();
            
            // print
            System.out.print(c + " ");
         }
      }catch(Exception e){
         // if any I/O error occurs
         e.printStackTrace();
      }finally{
         
         // releases all system resources from the streams
         if(is!=null)
            is.close();
         if(dos!=null)
            is.close();
         if(dis!=null)
            dis.close();
         if(fos!=null)
            fos.close();
      }
   }
}

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

65.56 66.89 67.98 68.82 69.55 70.37



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