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Write double to a file using DataOutputStream

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  1. /*
  2.   Write double to a file using DataOutputStream
  3.   This Java example shows how to write a Java double primitive value to a file using
  4.   writeDouble method of Java DataOutputStream class.
  5. */
  6.  
  7. import java.io.DataOutputStream;
  8. import java.io.FileOutputStream;
  9. import java.io.IOException;
  10.  
  11. public class WriteDoubleToFile {
  12.  
  13.   public static void main(String[] args) {
  14.    
  15.     String strFilePath = "C://FileIO//WriteDouble.txt";
  16.    
  17.     try
  18.     {
  19.       //create FileOutputStream object
  20.       FileOutputStream fos = new FileOutputStream(strFilePath);
  21.      
  22.       /*
  23.        * To create DataOutputStream object from FileOutputStream use,
  24.        * DataOutputStream(OutputStream os) constructor.
  25.        *
  26.        */
  27.      
  28.        DataOutputStream dos = new DataOutputStream(fos);
  29.      
  30.        double d = 165;
  31.      
  32.        /*
  33.         * To write a double value to a file, use
  34.         * void writeDouble(double d) method of Java DataOutputStream class.
  35.         *
  36.         * This method writes specified double to output stream as 8 bytes value.
  37.         * Please note that the double value is first converted to long using
  38.         * Double.doubleToLongBits method and then long is written to
  39.         * underlying output stream.
  40.         */
  41.        
  42.         dos.writeDouble(d);
  43.        
  44.         /*
  45.          * To close DataOutputStream use,
  46.          * void close() method.
  47.          *
  48.          */
  49.        
  50.          dos.close();
  51.        
  52.     }
  53.     catch (IOException e)
  54.     {
  55.       System.out.println("IOException : " + e);
  56.     }
  57.  
  58.   }
  59. }