String Immutability - APCS A Deep Dive

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http://www.supercs.net/2015/03/29/immutable-strings/

The String class can cause a lot of confusion for students as they first start working with code. We often introduce it early in the year, indeed it is hard to do many meaningful things without it. The problem is, as an example of a class data type, it can behave in some unusual ways...