Java Tricks: Fastest Way to Collecting Objects in a String

The fastest way to collect a list of objects in a String in Java:

StringBuilder buffer = new StringBuilder ();
String delim = "";
for (Object o: list)
{
    buffer.append (delim);
    delim = ", "; // Avoid if(); assignment is very fast!
    buffer.append (o);
}
buffer.toString ();

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