In fact, the reason for reporting an error is to throw an exception, which violates the fail fast protection mechanism

At this point, we replace the iterator to implement the loop

List<String> list=new ArrayList<>();
list.add("1");
list.add("2");
Iterator<String> iterator=list.iterator();
while(iterator.hasNext()){
    String item=iterator.next();
    if(Conditions for deleting elements){
        iterator.remove();
    }    
}


Exception Writing
for(String item:list){
    if(Conditions){
        list.remove(item);
    }
}