把数组排成最小的数

public String PrintMinNumber(int [] numbers) {
            String[] strs=new String[numbers.length];
        for(int i=0;i<numbers.length;i++)
            strs[i]=String.valueOf(numbers[i]);
        Arrays.sort(strs,new Comparator<String>(){
            public int compare(String s1,String s2){
                String s1s2=s1+s2;
                String s2s1=s2+s1;
                return s1s2.compareTo(s2s1);
            }
        });
          StringBuffer buf=new StringBuffer();
        for(String s:strs){
            buf.append(s);
        }
        return buf.toString();
    }