Small String optimization

Useless toString call in String concatination
Using String.valueOf instead of ""+
Use faster indexof('') version
Use appends(string, startI,EndI) directly

Change-Id: I937843410a4abc47803119e26073803fb1c1b115
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
3 files changed