morcble的blog

String的靜態方法split(String a)有點問題，列如
String a0 = "|we|r|";
String[] b0 = a0.split("|");
b0不會得到預期的數組，而是{"|","w","e","r","|"}.

于是寫了一個類代替這個方法
如下
public class Strings {
 public static  Collection seperateBy(String target,String seperate) {
      if (target==null||seperate==null||target.equals("")){
       return new ArrayList();
      }
      Collection collection = new ArrayList();
      int num = target.indexOf(seperate);
      if (num!=-1){
       if(num==0){
        target = target.substring(1,target.length());
            Collection here = seperateBy(target,seperate);
            for(Iterator iterator1 = here.iterator();iterator1.hasNext();){
             collection.add(iterator1.next());
            }
            return collection;
         }
       else if(num == target.length()-1){
        collection.add(target.substring(0,target.length()-1));
        return collection;
       }
       else
       {
        collection.add(target.substring(0,num));
        target = target.substring(num+1,target.length());
        Collection here = seperateBy(target,seperate);
           for(Iterator iterator1 = here.iterator();iterator1.hasNext();){
            collection.add(iterator1.next());
           }
           return collection;
       }
      }
      else collection.add(target);
      return  collection;
     }
/*測試
 public static  void main(String[] args) {
  Collection a1 = Strings.seperateBy("|aaa|aa","|");
  Collection a2 =Strings.seperateBy("|aaa|aa|","|");
  Collection a3 =Strings.seperateBy("aaa|aa","|");
  Collection a4 =Strings.seperateBy("aaaaa","|");
  Collection a5 =Strings.seperateBy("|aaa|aa","|");
  Collection a6 =Strings.seperateBy("||||","|");
  Collection a7 =Strings.seperateBy("","|");
 }*/
}



正則表達式問題

正確寫法String a0 = "|we|r|";
String[] b0 = a0.split("\\|");