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为什么我在代码中的指定位置获得ConcurrentModificationException？我无法弄清楚我做错了什么...该removeMin()方法用于定位列表中的min pq,删除它,并返回其值

import java.util.Iterator;
import java.util.LinkedList;

public class test1 {

    static LinkedList<Integer> list = new LinkedList<Integer>();

    public static void main(String[] args) {
        list.add(10);
        list.add(4);
        list.add(12);
        list.add(3);
        list.add(7);

        System.out.println(removeMin());
    }

    public static Integer removeMin() {
        LinkedList<Integer> pq = new LinkedList<Integer>();
        Iterator<Integer> itPQ = pq.iterator();

        // Put contents of list into pq
        for (int i = 0; i < list.size(); i++) {
            pq.add(list.removeFirst());
        }

        int min = Integer.MAX_VALUE;
        int pos = 0;
        int remPos = 0;

        while (itPQ.hasNext()) { …