Learn Java Programming - StringBuilder Introduction Tutorial
I am going to produce several tutorials relating to the StringBuilder class. In each of these tutorials I will be comparing similarities and differences to the String class. The String class has all sorts of nuances that I have addressed in my multi-part String tutorials. I recommend watching all of the String related tutorials to get a good feel for the String class capabilities. The most notable difference between the StringBuilder class and the String class is that String class is immutable and the StringBuilder class is mutable.
Object state is a fancy term for describing the values held by instance variables. Immutable means that the object state cannot be modified once it is instantiated. Mutable means that the object state can be modified after it is instantiated.
Immutable state example:
final char objectState[] = { 'H', 'E', 'L', 'L', 'O' };
objectState = new char[] { 'C', 'A', 'T'}; // Illegal! final won't allow objectState to be assigned to another object
Mutable state example:
char objectState[] = { 'H', 'E', 'L', 'L', 'O' };
objectState = new char[] { 'C', 'A', 'T'}; // no problem - object state is now CAT
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