playing ogg voices as smooth as possible in java TTS

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Java

audio

speech

hello guys
Am developing a TTS for my own language in java (its my final project which is not developed before, therefor I could NOT use built-in classes). I can recognize the diphones for input text, for playing: I place the diphones in an array, after the input text analysis completed I play the audio files (which are in ogg format) according to the diphones in the array one by one. what I want to ask is: what do you think about this way for playing separate diphones? and what to do to make it smoother because its really not smooth (there is a big gap between playing one file and next one)