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In both sets of code it tells you how to append to a string. For String objects, the + operator is defined as appending two strings together (the += operator similarly appends and re-assigns). Note...

message += "your message goes here";

An alternative (if you're interested in performance, though with modern day computers and this situation this is a non-issue) is to use the StringBuilder class...

The problem is you're re-assigning the value of message to a new string, rather than simply appending to it. This erases all the old messages.

The formatter's picky about spaces.

So [highlight=java] (no spaces) is the correct syntax, where-as [highlight = java] (with spaces) won't work properly.

I'm a little unsure of what you mean by...