Java ObjectInputStream readDouble() Method with Examples

by Online Tutorials Library July 22, 2022

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

Next TopicJava ObjectInputStream

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