File Channels and Buffers in Java I/O, Slides of Java Programming

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1

Chapter 10: Writing Files

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Basic Information

• You can regard the file as a series of bytes with no specific information about its structure
• Common file extension give us some clues about the file internal structure
• Two Modes of accessing file:
  • Sequential access
  • Random access

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File Channels (Cont.)

Your program

Buffer Object

File Stream Object

Channel Object

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• Almost all classes inherit from the Buffer class. They are found in java.nio
• ByteBuffer is the only one used in I/O
• Viewer Buffers as CharBuffer, Double, etc.
• Buffer capacity, position, and limit {capacity(), position(), limit(), remaining(), hasRemaining()}
• Buff.limit(512).position(256)
• ByteBuffer buff = ByteBuffer.allocate(1024);
• IntBuffer intBuf = buf.asIntBuffer();
• ByteBuffer buf = ByteBuffer.wrap(str.getBytes());
• Relative put/get and absolute put/get

The Buffer Class