不使用修剪方法从字符串中删除空格？

试试这个

StringTokenizer t = new StringTokenizer(str," ");result = t.nextToken();Boolean first = str.toCharArray()[0]==' ';Boolean last = str.toCharArray()[str.length()-1]==' ';while(t.hasMoreTokens()){    result += " " + t.nextToken();}switch(strMode){    case 0 : if(last) result += " ";  break;    case 1 : if(first) result = " " + result;  break;}System.out.println(result);