面试题45-把数组排成最小的数

题目描述
输入一个正整数数组，把数组里所有数字拼接起来排成一个数，打印能拼接出的所有数字中最小的一个。例如输入数组{3，32，321}，则打印出这三个数字能排成的最小数字为321323。

package jianzhi_offer;
import java.util.Arrays;
import java.util.Comparator;
public class minValue {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int[] numbers = {3,32,321};
		String result = printMinNumber(numbers);
		System.out.println(result);
	}
	
	public static String printMinNumber(int[] numbers) {
		if(numbers == null || numbers.length == 0) {
			return "";
		}
		
		int len = numbers.length;
		String[] str = new String[len];
		StringBuffer sb = new StringBuffer();
		
		for(int i = 0;i < len; i++) {
			str[i] = String.valueOf(numbers[i]);
		}
		
		Arrays.sort(str,new Comparator<String>() {

			@Override
			public int compare(String o1, String o2) {
				// TODO Auto-generated method stub
				String s1 = o1 + o2;
				String s2 = o2 + o1;
				
				return s1.compareTo(s2);
				
			}
			
		});
		
		for(int i = 0;i < len; i++) {
			sb.append(str[i]);
		}
		
		return sb.toString();
		
	}

}