"o_neww_ww_123"分割字符串split

public class Test01 {      public static void main(String[] args) {          String str = "o_neww_ww_123";         String regex = "_";         String[] strs = str.split(regex);         for(int i = 0; i < strs.length; i++) {             System.out.println(strs[i]);       }       String ss="";       for(int i=0;i<strs.length-1;i++){      if(i==strs.length-2)      ss+=strs[i];       else      ss+=strs[i]+"_";        }       System.out.println(ss+"::");    }  }