如何删除ArrayList的元素 [英] How to delete elements from arrayList

问题描述

private static void printInvoice() {

    for (int i = customerList.size()-1; i >= 0; i--) {
        for(int n = taskChecker.size() -1; n >=0 ; i--){
        System.out.println(customerList.get(i).getName());
        customerList.get(i).invoiceForCustomer();
        taskChecker.remove(n);    

    }
}

这是什么得到打印出来：

This is whats get printed out:

Sven 9900 Task: Rosta knäck Date: 2014-02-11 Numbers of hours: 1
Tor 4950 Task: Rosta bröd Date: 2013-12-12 Numbers of hours: 1
Oden 4950 Task: Rosta bröd  Date: 2013-12-12  Numbers of hours: 1

现在我想删除的任务（奥登4950任务：罗斯塔布罗德日期：1：小时2013年12月12日号）我已经打印出来了。我真的糊涂了，我应该怎么做呢？

Now I want to delete the tasks (Oden 4950 Task: Rosta bröd Date: 2013-12-12 Numbers of hours: 1) after I've printed them out. I'm really confused over how I should do this...

推荐答案

您不能从你当前循环通过不使用的Iterator 列表中删除的项目。它构成了一个 ConcurrentModificationException的。至于你的问题，各国的评论，请使用的Iterator 对象，以允许您在操作上的列表中删除。

You cannot remove items from a list you a currently looping through without using an Iterator. It constitutes a ConcurrentModificationException. As the comment to your issue states, use an Iterator object in order to allow deletion from the list you are operating on.

正如的Iterator 使用一个简单的例子：

Just as a simple example of Iterator usage:

Iterator<Object> it = listOfObjects.iterator();
while (it.hasNext())
{
    Object o = it.next();
    it.remove(); <--- removes the last object returned from Iterator.next() from the underlying collection
}

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