小编Tra*_*vis的帖子

好的,所以我正在研究搜索方法,搜索的术语在数据库中运行,匹配的产品被添加到带有2个整数字段的hashMap中.

在制作了hashmap之后,将显示这些项目,但是我无法通过hashmap打印出详细信息

这是我的代码

public HashMap<Integer, Integer> bankSearch = new HashMap<Integer, Integer>();

和使用

    Iterator it = bankSearch.entrySet().iterator();
    while (it.hasNext()) {
        HashMap.Entry pairs = (HashMap.Entry)it.next();
        System.out.println(pairs.getKey() + " = " + pairs.getValue());
        if (bankItemsN[i] > 254) {
            outStream.writeByte(255);
            outStream.writeDWord_v2(pairs.getValue());
        } else {
            outStream.writeByte(pairs.getValue()); // amount
        }
        if (bankItemsN[i] < 1) {
            bankItems[i] = 0;
        }
        outStream.writeWordBigEndianA(pairs.getKey()); // itemID
    }

目前的错误

.\src\client.java:75: cannot find symbol
symbol  : class Iterator
location: class client
                Iterator it = bankSearch.entrySet().iterator();
                ^
.\src\client.java:77: java.util.HashMap.Entry is not public in …

我运行一个服务器，它有一个处理计时系统的事件处理程序当我连续运行其中 3 个时，它给出了这个异常

Exception in thread "Thread-8" java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at EventManager.run(EventManager.java:77)
        at java.lang.Thread.run(Thread.java:662)

这是问题的来源方法：

EventManager.getSingleton().addEvent( new Event() { 
                public void execute(EventContainer c) {
                    p.createProjectile(p.absY, p.absX, offsetY, offsetX, 1166, 43, 31, 70, p2.playerId);
                    c.stop(); // stops the event from running
                }
            }, 950); // in ms (1 second = 1000 ms)
EventManager.getSingleton().addEvent( new Event() { 
                public void execute(EventContainer c) {
                    p2.applyDAMAGE(misc.random(25));
                    c.stop(); // stops the event from running
                }
            }, 1300); // in ms (1 second = 1000 …