A simple question?

Who can tell me what the difference between out.clear() and out.clearBuffer() is? Please give me the examples in details. Thanks.

Both clear the contents of the buffer. clearBuffer() merely clears the buffer but doesn't throw IOException if the buffer has already been flushed when clear() does.
BTW, pls revisit the Policies of login name and displayed name when you registered. "Use a fist name, a space, and a last name. No commas or underscores, and the last name must be more than one letter. Obviously fictitious names or improperly formatted names may be locked out. "