Comparing Buffered and Unbuffered Writing Performance

import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;

public class BufferDiff {
  public static void main(String args[]) throws IOException {
    FileOutputStream unbufStream;
    BufferedOutputStream bufStream;
    unbufStream = new FileOutputStream("test.one");
    bufStream = new BufferedOutputStream(new FileOutputStream("test.two"));
    System.out.println("Write file unbuffered: " + time(unbufStream) + "ms");
    System.out.println("Write file  buffered: " + time(bufStream) + "ms");
  }

  static int time(OutputStream os) throws IOException {
    Date then = new Date();
    for (int i = 0; i < 500000; i++) {
      os.write(1);
    }
    os.close();
    return (int) ((new Date()).getTime() - then.getTime());
  }
}

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6.	Input and output using strings and string buffers
7.	Timing Unbuffered Reads
8.	Reading Bytes from a DataInputStream
9.	Read a file and print, using LineReader and System.out
10.	Demonstrate ProgressMeterInputStream
11.	Converting text to and from ByteBuffers
12.	Demonstrates standard I/O redirection
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15.	Mapping an entire file into memory for reading
16.	Mapped IO
17.	What happens when the entire file isn't in your mapping region
18.	Object serialization
19.	Locking portions of a mapped file
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Comparing Buffered and Unbuffered Writing Performance : Input Output Stream « File Input Output « Java

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