Java gives you the ability to dynamically create strings. Even after you set the string value, you can add more characters to the string value throughout the code. This process lets you build a ...

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!