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1¡¢public static void main(String[] args) {
    List<String> paramList = new ArrayList<>();
    paramList.add("a");
    paramList.add("b");
    paramList.add("c");
    handleList2(paramList);
    System.out.println(JSONObject.toJSONString(paramList));
}

private static void handleList2(List<String> paramList) {
    Iterator<String> iterator = paramList.iterator();
    while (iterator.hasNext()){
        if ("a".equals(iterator.next())){
            iterator.remove();
        }
    }

}

2¡¢Éý¼¶°æ

private static void handleList2(List<String> paramList) {
    Iterator<String> iterator = paramList.iterator();
    while (iterator.hasNext()){
        synchronized (paramList){
            if ("a".equals(iterator.next())){
                iterator.remove();
            }
        }
    }

}