datafileexample.java

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// Introduced in Chapter 17
import java.io.*;

/** Example of storing data in binary format. */
public class DataFileExample {

  /**
   * If an int is provided on the command line, store it in
   * number.data.  Otherwise, read an int from number.data
   * and print it.
   */
  public static void main(String[] args) throws IOException {
    File file = new File("number.data");
    if (args.length > 0) {
      ObjectOutputStream out
        = new ObjectOutputStream(new FileOutputStream(file));
      out.writeInt(Integer.parseInt(args[0]));
      out.close();
    } else {
      ObjectInputStream in
        = new ObjectInputStream(new FileInputStream(file));
      System.out.println(in.readInt());
    }
  }
  
}