Java Data Type - 如何获得唯一字符串列表的随机排序

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {
  public static void main(String[] argv) throws Exception {
    List<Integer> list = new ArrayList<Integer>();

    for (int i = 1; i <= 12; i++)
      list.add(new Integer(i));

    Collections.shuffle(list);
    System.out.println(list);
  }
}