public String[]split(String regex,int limit){/* fastpath if the regex is a
(1)one-char String and this character is not one of the
RegEx's meta characters ".$|()[{^?*+\\", or
(2)two-char String and the first char is the backslash and
the second is not the ascii digit or ascii letter.
*/char ch =0;if(((regex.value.length ==1&&".$|()[{^?*+\\".indexOf(ch = regex.charAt(0))==-1)||(regex.length()==2&&
regex.charAt(0)=='\\'&&(((ch = regex.charAt(1))-'0')|('9'-ch))<0&&((ch-'a')|('z'-ch))<0&&((ch-'A')|('Z'-ch))<0))&&(ch < Character.MIN_HIGH_SURROGATE ||
ch > Character.MAX_LOW_SURROGATE)){int off =0;int next =0;boolean limited = limit >0;
ArrayList<String> list =newArrayList<>();while((next =indexOf(ch, off))!=-1){if(!limited || list.size()< limit -1){
list.add(substring(off, next));
off = next +1;}else{// last one//assert (list.size() == limit - 1);
list.add(substring(off, value.length));
off = value.length;break;}}// If no match was found, return thisif(off ==0)returnnewString[]{this};// Add remaining segmentif(!limited || list.size()< limit)
list.add(substring(off, value.length));// Construct resultint resultSize = list.size();if(limit ==0){while(resultSize >0&& list.get(resultSize -1).length()==0){
resultSize--;}}
String[] result =newString[resultSize];return list.subList(0, resultSize).toArray(result);}return Pattern.compile(regex).split(this, limit);}