Use of string concatenation strings and StringBuilder (StringBuffer) in Java

String concatenation is a common function, often using string concatenation, when the number of stitching, using the string method will consume a lot of performance and time, because each string splicing will create a new object, with the increase in splicing times, performance consumption, The time consuming will increase a lot, this time should use the StringBuilder method.

1  Public Static voidMain (string[] args) {2         Try {3             intCount = -;4 5             LongBegin =System.currenttimemillis ();6 teststring (count);7             LongEnd =System.currenttimemillis ();8             LongTime = end-begin;9System. out. println ("String Method Stitching"+count+"Times Consumed:"+ Time +"milliseconds");Ten  OneBegin =System.currenttimemillis (); A Teststringbuilder (count); -End =System.currenttimemillis (); -Time = end-begin; theSystem. out. println ("StringBuilder Method Stitching"+count+"Times Consumed:"+ Time +"milliseconds"); -  -}Catch(Exception e) { - e.printstacktrace (); +         } -  +     } A  at     Private StaticString teststring (intcount) { -String result =""; -  -          for(inti =0; I < count; i++) { -Result + ="Hello"; -         } in  -         returnresult; to     } +  -     Private StaticString Teststringbuilder (intcount) { theStringBuilder SB =NewStringBuilder (); *  $          for(inti =0; I < count; i++) {Panax NotoginsengSb.append ("Hello"); -         } the  +         returnsb.tostring (); A}

Operation Result:

String method Splicing 500 times Elapsed time: 2 ms StringBuilder method Stitching 500 times Elapsed time: 0 ms

String method Splicing 50,000 times elapsed time: 4973 ms StringBuilder method Stitching 50,000 times Elapsed time: 3 ms

Use of string concatenation strings and StringBuilder (StringBuffer) in Java