java.util.ConcurrentModificationException

        String nameString = "test";
        List<String> nameStrings = new ArrayList<String>();
        for(int i=0;i<10;i++){
           
            nameStrings.add(nameString);
        }
        for(String name:nameStrings){
           
            nameStrings.remove(name);
        }

throw Exception in thread "main" java.util.ConcurrentModificationException.

change as follow will be ok ：
for(int i=0;i<nameStrings.size();i++){
           
            nameStrings.remove(i);
        }