public static void main(String args[]) {
        int length = 1;
        StringBuffer sb = new StringBuffer(length);
        for (int i = length; i < 7; i++) {
            sb.append(" ");
        }
        System.out.println(sb.toString() + "!!!");
    }

------解决方案--------------------
  [code=Java][/code]
StringBuffer sb=new StringBuffer("aaa");
       for(int i=3;i<7;i++){
       sb.append(" ");
       }
     sb.toString();
       System.out.println(sb+"!!!");
       }

[/code]  

结果：[code=Java]
aaa    !!!