Java ObjectInputStream readDouble() Method

The readDouble() method of ObjectInputStream is used to read 64-bit double.

Syntax

Parameter

No parameter is passed.

Returns

The 64-bit double read.

Throws

EOFException - If the end of file is reached.

IOException - If other I/O error has occurred.

Example 1

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 ObjectInputStreamreadDoubleExample1  {
   public static void main(String[] args) throws IOException {
      
      byte[] buf = {'j', 'a', 'v', 'a', 'T', 'p', 'o', 'i', 'n', 't'};
      
      try {
         // create file output stream
       FileOutputStream   fileoutstream = new FileOutputStream("file1.txt");
         
         // create data output stream
        DataOutputStream dataoutstream = new DataOutputStream(fileoutstream);
         
         // for each byte in the buffer
         for (byte b:buf) {
            // write character to the dos
            dataoutstream.writeDouble(b);
         }
         
         // force bytes to the underlying stream
         dataoutstream.flush();
         
         // create file input stream
         InputStream inpstream = new FileInputStream("file1.txt");
         
         // create new data input stream
        DataInputStream datainpstream = new DataInputStream(inpstream);
         
         // read till end of the stream
         while(datainpstream.available()>0) {
         
            // read character
            Double c = datainpstream.readDouble();
            
            // print
            System.out.print("    "+c);
         }
         
      } catch(Exception e) {
            
         e.printStackTrace();
      } 
   }
}

Output:

106.0    97.0    118.0    97.0    84.0    112.0    111.0    105.0    110.0    116.0

Example 2

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 ObjectInputStreamreadDoubleExample2  {
   public static void main(String[] args) throws IOException {
      
      double[] carray = {21.0, 22.0 , 23.0 , 45.0 , 67.9 , 66.0};
      
      try {
         // create file output stream
       FileOutputStream   fileoutstream = new FileOutputStream("file1.txt");
         
         // create data output stream
        DataOutputStream dataoutstream = new DataOutputStream(fileoutstream);
         
         // for each byte in the buffer
         for (double b:carray) {
            // write character to the dos
            dataoutstream.writeDouble(b);
         }
         
         // force bytes to the underlying stream
         dataoutstream.flush();
         
         // create file input stream
         InputStream inpstream = new FileInputStream("file1.txt");
         
         // create new data input stream
        DataInputStream datainpstream = new DataInputStream(inpstream);
         
         // read till end of the stream
         for(int i=0;i<=carray.length;i++){ 
         
            // read character
            double c = datainpstream.readDouble();
            
            // print
            System.out.print("    "+c);
         }
         
      } catch(Exception e) {
        
      } 
   }
}

Output:

21.0    22.0    23.0    45.0    67.9    66.0

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