StringBuilder vs. .concat vs. “+” Operator relative performance different in eclipse than command line?

Question

I was reading about how when possible the java compiler will compile strings concatenated with the \"+\" operator into instances of StringBuilder, and how this makes it bett

Answer 1

Try to place StringBuilder toBuild = new StringBuilder() above the loop. The same with String toPrint and do += for string and you will see the difference.
Don't create new String and StringBuilder in the loop.