Java生成一個無序序列

package com.xhu.edu.utils;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Random;
import java.util.Set;

public class DButil {
	public static void main(String[] args) {
		List<Integer> a=new ArrayList<Integer>();
		Random random=new Random();
		Set<Integer> set=new LinkedHashSet<Integer>(a);
		while(set.size()<12){
			set.add(random.nextInt(12)+1);
		}
		Iterator<Integer> iterator;
		iterator=set.iterator();
		while(iterator.hasNext()){
			System.out.println(iterator.next());
		}
		System.out.println(set.toString());
	}
}