相关疑难解决方法(0)

以下Java代码ConcurrentModificationException按预期抛出:

public class Evil
{
    public static void main(String[] args) {
        Collection<String> c = new ArrayList<String>();
        c.add("lalala");
        c.add("sososo");
        c.add("ahaaha");
        removeLalala(c);
        System.err.println(c);
    }
    private static void removeLalala(Collection<String> c) 
    {
        for (Iterator<String> i = c.iterator(); i.hasNext();) {
            String s = i.next();
            if(s.equals("lalala")) {
                c.remove(s);
            }
        }
    }
}

但是下面的示例(仅在内容中有所不同)Collection执行时没有任何异常:

public class Evil {
    public static void main(String[] args) 
    {
        Collection<String> c = new ArrayList<String>();
        c.add("lalala");
        c.add("lalala");
        removeLalala(c);
        System.err.println(c);
    }
    private static void removeLalala(Collection<String> c) {
        for (Iterator<String> i …