BufferedOutputStream : BufferedOutputStream « File « Java Tutorial

1. Java Tutorial
2. File
3. BufferedOutputStream

You should always wrap your OutputStream with a BufferedOutputStream for better performance. The BufferedOutputStream class has two constructors that accept an OutputStream.

public BufferedOutputStream (OutputStream out)
public BufferedOutputStream (OutputStream out, int bufferSize)

The first constructor uses the default buffer size, the second lets you decide.

FileOutputStream fos = new FileOutputStream (aFile);
BufferedOutputStream bos = new BufferedOutputStream(fos);