今天写个代码，提示java.util.ConcurrentModificationException

Question

今天写个代码，提示java.util.ConcurrentModificationException
并发修改异常，但是我这个是不是并发的方法呀？

private List<Employee> removeList(List<Employee> employees) {
        for (Employee employee : employees) {
            if(employee.getName().length() <= 3){
                employees.remove(employee);
            }
        }
        return employees;
    }

改成这样就好了。请问什么原因

private List<Employee> removeList(List<Employee> employees) {
        employees.removeIf(employee -> employee.getName().length() <= 3);
        return employees;
    }

或者修改成这样

private List<Employee> removeList(List<Employee> employees) {
        List <Employee> list = new ArrayList<>();
        for (Employee employee : employees) {
            if(employee.getName().length() > 3){
                list.add(employee);
            }
        }
        return list;
    }

ps：第一种修改的方法不太明白

Answer 1

• 这篇博客也许可以解决你的问题👉 ：java.util.ConcurrentModificationException详解