去掉字符串前后空格

1 public String replaceBlank(String str){
2           Pattern pt=Pattern.compile("^\\s*|\\s*$","");
3           Matcher mt=pt.matcher(str);
4           str=mt.replaceAll("");
5           return str;
6          }

1 while(str.endsWith(" ")){
2     str = str.subString(0,str.length()-1);
3 }
4 while(str.startsWith(" ")){
5     str = str.subString(1);          
6 }