Use Minecraft more than 16 characters with getTeams?

I tried to write a Java plugin that has the function of a prefix system. I'm not that big with Java so I would like to ask you how I can use more than 16 characters for the prefix. My friend told me something about a library or something. Can someone help me there?

You can easily create the name of the team with under 16 characters, but design the display name however you want

Or am I wrong?