LinkedList迭代器next（）即使在hasNext（）返回true后调用，也会引发NoTouchElementException

Question

LinkedList迭代器next（）即使在hasNext（）返回true后调用，也不会引发任何TouchElementException。

环境：Sun Solaris上的Java6

知道为什么我在Next（）方法调用时遇到这个异常吗？

// lines is an instance of LinkedList
// writer is a FileWriter, Believe that is irrelevant to issue
while(lines.hasNext()){
    int i = 0;
    do {
            writer.write(lines.next());
            writer.newLine();
            i++;
    } while (lines.hasNext() && i < targetLineCount);
    // Some more code... 
}

使用更多代码更新

public class MyClass { // Only one instance of this class is used across application
    private List<String> master = new LinkedList<String>();
    // Other instance members to tune this instance behaviour

    public MyClass(){
        // Read Source & populate master
    }

    public boolean writeDataSlot(Writer writer, int targetLineCount){ // Can be called by different Threads
        Ierator<String> lines = master.iterator();
        while(lines.hasNext()){
            int i = 0;
            do {
                writer.write(lines.next());
                writer.newLine();
                i++;
            } while (lines.hasNext() && i < targetLineCount);
            // Some more code to populate slot from different source.
        }
    }
}

Answer 1

我看到了这些可能性：

1. <代码>行是从另一个线程使用的
2. <代码>行。next（）在中调用。//其他一些代码
3. 行已绑定到中的另一个实例//其他一些代码

Answer 2

正如Axel所指出的，这似乎是一个线程问题。

如果使此方法同步，会发生什么情况？

public synchronized boolean writeDataSlot(Writer writer, int targetLineCount)