UltraEdit does not do a great job of auto-completion compared to an IDE like Eclipse etc., because it does not know how to parse tokens in a specific language, i.e. There is no way to find out that your variable / method names and enumeration are only for autocomplete.
However, UltraEdit has a built-in default autocomplete function (control + space) - UltraEdit will look back 50K in the active file from the cursor location for words that match a partially printed word and show them. Go to "Advanced"> "Configuration"> "Editor"> "AutoFill", and you can check the option "automatically display autofill dialog" after X number of characters.
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