java.util.Abstractlist 处的 Java ConcurrentModificationException

Question

我在 Servlet 类中有以下代码，我得到

ConcurrentModificationException checkforcomodification at java.util.Abstractlist

at for(项目持续:projectList){

如何解决此问题以及导致此异常的原因

代码片段

List<Projects> projectList = new ArrayList<Projects>();
Projects project = new Projects();
projectList.add(project);
for (Projects persist: projectList) { // error in this line
persist.setPNo(pNo);
persist.setExpirtyDate(eDate;

myDAO.persistProjects(projectList);
projectList.clear();        
    }

Answer 1

错误是您正在清除循环内的列表projectList.clear();。

for 循环中的最后一行抛出错误，而不是第一行。

也许你可以做的是在处理循环后清除列表

List<Projects> projectList = new ArrayList<Projects>();
Projects project = new Projects();
projectList.add(project);
for (Projects persist: projectList) { // error in this line
    persist.setPNo(pNo);
    persist.setExpirtyDate(eDate);

}
myDAO.persistProjects(projectList);
projectList.clear();