Java I/O How to - Write byte array to a file

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Question

We would like to know how to write byte array to a file.

Answer

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
//from w  w  w.  j av  a 2  s  .co  m
public class Main {

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

    int howMany = 20;

    ByteArrayOutputStream bout = new ByteArrayOutputStream(howMany * 4);
    DataOutputStream dout = new DataOutputStream(bout);

    for (int i = 0; i <= 20; i++) {
      dout.writeInt(i);
    }

    FileOutputStream fout = new FileOutputStream("fibonacci.dat");
    try {
      bout.writeTo(fout);
      fout.flush();
    } finally {
      fout.close();
    }
  }
}

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