foreach 循环，删除list中的元素是报错

最近项目中碰到一个从list中去掉一定条件的元素的问题，第一反应就是用foreach进行循环操作，具体代码如下

if (list1.size() > 0) {
for(ParkingOrderEntity parkingOrderEntity : list1){
if(parkingOrderEntity.getStatus().name().equals(OrderStatus.billing.name())){
list1.remove(parkingOrderEntity);
}
}
}

但是确报了这样一个错误

java.util.ConcurrentModificationException: null
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901) ~[na:1.8.0_111]
at java.util.ArrayList$Itr.next(ArrayList.java:851) ~[na:1.8.0_111]
at com.infofuse.webServices.park.WebParkCheckResource.getBillingOrdersByLicencePlate(WebParkCheckResource.java:85) ~[classes/:na]
at com.infofuse.webServices.park.WebParkCheckResource$$FastClassBySpringCGLIB$$e163b36e.invoke(<generated>) ~[spring-core-4.2.0.RELEASE.jar:na]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.2.0.RELEASE.jar:4.2.0.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717) ~[spring-aop-4.2.0.RELEASE.jar:4.2.0.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) [spring-aop-4.2.0.RELEASE.jar:4.2.0.RELEASE]
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:97) ~[spring-aop-4.2.0.RELEASE.jar:4.2.0.RELEASE]
at com.infofuse.webServices.common.WSProcessAspect.around(WSProcessAspect.java:102) ~[classes/:na]
at sun.reflect.GeneratedMethodAccessor248.invoke(Unknown Source) ~[na:na]

Java foreach只能用于只读的情况.如果需要删除操作,可以使用迭代器或者for循环直接遍历List.。所以在使用foreach来进行修改删除操作的时候会抛出个ConcurrentModificationException并发修改异常