Java - 多次从ArrayList中删除时出错。 （IllegalStateException异常）

Question

我一直在谷歌搜索，似乎无法找到解决方案。我在这做错了什么？我的问题在标题中。这是我得到的例外：

java.lang.IllegalStateException
at java.util.ArrayList$Itr.remove(Unknown Source)
at me.herp.derp.client.Config.updateItem(Config.java:24)
at me.herp.derp.client.Commands.parseCommand(Commands.java:23)
at me.herp.derp.client.ChatCommands.handleChatcommand(ChatCommands.java:29)
at net.minecraft.src.EntityClientPlayerMP.sendChatMessage(EntityClientPlayerMP.java:171)
at net.minecraft.src.GuiChat.keyTyped(GuiChat.java:104)
at net.minecraft.src.GuiScreen.handleKeyboardInput(GuiScreen.java:227)
at net.minecraft.src.GuiScreen.handleInput(GuiScreen.java:176)
at net.minecraft.client.Minecraft.runTick(Minecraft.java:1494)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:843)
at net.minecraft.client.Minecraft.run(Minecraft.java:768)
at java.lang.Thread.run(Unknown Source)

这是我的代码：

public static void updateItem(String item, String value)
{
    if (!hasValue(item))
    {
        addItem(item, value);
        return;
    }
    for (ConfigItem c : configItems)
    {
        if (c.ITEM.equals(item))
        {
            configItems.iterator().remove();
            break;
        }
    }
    ConfigFile.saveConfig();
}

Answer 1

您的迭代器未正确初始化（未调用next()）。我建议像这样编写这段代码：

Iterator<ConfigItem> it = configItems.iterator();
while(it.hasNext()){
    ConfigItem c = it.next();
    if (c.ITEM.equals(item))
    {
        it.remove();
        break;
    }
}

Answer 2

只能在Iterator.next（）之后调用Iterator.remove（）。试试这个：

Iterator<ConfigItem> i = configItems.iterator();
while(i.hasNext()) {
    ConfigItem next = i.next();
    if (next.equals(item))
    {
        i.remove();
        break;
    }