An Efficient Method of String Concatenation

A good way to concatenate strings in a loop or when performing multiple concatenations, is to use the StringBuilder class:

1 String s  =   " a "
2 s += " b " ;  // this is slow
3
4 StringBuilder sb  =   new  StringBuilder();
5 sb.Append( " a " );
6 sb.Append( " b " );

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