Java IO Tutorial - Java ObjectInputStream .readDouble ()

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Syntax

ObjectInputStream.readDouble() has the following syntax.

public double readDouble()   throws IOException

Example

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

// w w w  . j  a v  a 2  s  .c o  m
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class Main {

  public static void main(String[] args) throws Exception {

    double b = 123.234d;

    FileOutputStream out = new FileOutputStream("test.txt");
    ObjectOutputStream oout = new ObjectOutputStream(out);

    // write something in the file
    oout.writeDouble(b);
    oout.writeDouble(456.789d);
    oout.flush();
    oout.close();
    // create an ObjectInputStream for the file we created before
    ObjectInputStream ois = new ObjectInputStream(new FileInputStream(
        "test.txt"));

    // read and print a double
    System.out.println(ois.readDouble());

    // read and print a double
    System.out.println(ois.readDouble());
    ois.close();
  }
}

The code above generates the following result.

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