OnJava8-Examples/iostreams/StoringAndRecoveringData.java

// iostreams/StoringAndRecoveringData.java
import java.io.*;

public class StoringAndRecoveringData {
  public static void main(String[] args)
  throws IOException {
    try(DataOutputStream out = new DataOutputStream(
          new BufferedOutputStream(
            new FileOutputStream("Data.txt")))) {
      out.writeDouble(3.14159);
      out.writeUTF("That was pi");
      out.writeDouble(1.41413);
      out.writeUTF("Square root of 2");
    }
    DataInputStream in = new DataInputStream(
      new BufferedInputStream(
        new FileInputStream("Data.txt")));
    System.out.println(in.readDouble());
    // Only readUTF() will recover the
    // Java-UTF String properly:
    System.out.println(in.readUTF());
    System.out.println(in.readDouble());
    System.out.println(in.readUTF());
  }
}
/* Output:
3.14159
That was pi
1.41413
Square root of 2
*/