实现字符串 trim 功能

        String x = "  dfdfdf  " ;
        char[] array = x.toCharArray();

        int begin = 0;
        for(int i= 0;i<array.length;i++){
            if(' '==array[i]){
                continue;
            }else {
                begin=i;
                break;
            }
        }

        int end  = x.length()-1;
        for(int i= x.length()-1;i>=0;i--){
            if(' '==array[i]){
                continue;
            }else {
                end=i;
                break;
            }
        }

        String newString =  x.substring(begin,end) ;
        System.out.println(newString);
        System.out.println(newString.length()) ;