6. DataOutputStream, writing binary data

• Construct java.io.BufferedOutputStream object

• Assign it to OutputStream

• Opening a file with a buffer:

  • FileOutputStream must be instantiated first, and the constructor requires a File object or a file name.

  • BufferedOutputSream object must be instantiated. The constructor requires the FileOutputStream object.

  • DataOutputStream object must be instantiated. Its constructor takes the BufferedOutputStream object.

  
      DataOutputStream out =
          new DataOutputStream(
          new BufferedOutputStream(
          new FileOutputStream("books.bin")));
  
  

• Note that DataOutputStream implements the DataOutput interface.