Main.java

import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.List; import java.util.stream.Collectors; import java.util.stream.Stream;
public class Main { 
  private static String filename = "fib1000";
  
  static Stream<Long> fibonacciStream() {
      return Stream.iterate(new long[]{1, 0}, (f) -> new long[]{f[0] + f[1], f[0]}).map(f -> f[0]);
  }
  
  public static void main(String[] args) throws Exception {
      List<Long> fib1000 = fibonacciStream().limit(1000).collect(Collectors.toList());
      try (ObjectOutputStream oss = new ObjectOutputStream(new FileOutputStream(filename))) {
          oss.writeObject(fib1000);
      }
      Object deserializedFib1000;
      try (ObjectInputStream oss = new ObjectInputStream(new FileInputStream(filename))) {
          deserializedFib1000 = oss.readObject();
      }
      System.out.println(fib1000.equals(deserializedFib1000));
  }
}