Append a String onto another String

This example shows how to append several Strings, depending on how many arguments that are passed to the main method from the command line.
It uses a StringBuffer object to append each String. This is more efficient than using the + operator, since that will produce a new String in memory every time a concatenation occurs.
Finally it uses a System.out.println statement to print out the appended string. Since we want to print out the contents of the StringBuffer, the toString() method is called on it.

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