Even though the introduction of Unicode technically solved this problem, you can still encounter situations in which some or all of your Unicode characters will not display properly in Java programs.

You can only represent the ASCII subset of Unicode within the range of a byte. If you wanted to filter one or more Unicode characters from a Java stream, you're hosed!

High-fives, colorful hearts, and a horrible goose top a short list of new emoji Unicode Consortium has recently sought to rein in the number of new emoji.