gistfile1.java

import java.io.ByteArrayOutputStream;

public class TestByteArray {

  static byte[] chunk = new byte[1024 * 1024];
  public static void main(String[] args) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    int numChunks = 2 * 1024 * 1024;
    for (int  i = 0; i < numChunks; ++i) {
      long start = System.currentTimeMillis();
      baos.write(chunk, 0, chunk.length);
      long end = System.currentTimeMillis();
      System.out.println("Chunk " + i + " of " + numChunks + " took: " + ((end - start) / 1000.0) + "s, total written: " + (i * chunk.length) + " bytes");
    }
  }
}