import java.io.*;

public class CreateLargeFile {
  public static void main(String[] args) throws Exception {
    DataOutputStream output = new DataOutputStream(
      new BufferedOutputStream(
      new FileOutputStream("largedata.dat")));

    for (int i = 0; i < 2_000_000; i++)
      output.writeInt((int)(Math.random() * 1000000));

    output.close();

    // Display first 100 numbers
    DataInputStream input = new DataInputStream(
      new BufferedInputStream(new FileInputStream("largedata.dat")));
    for (int i = 0; i < 100; i++)
      System.out.print(input.readInt() + " ");

    input.close();
  }
}