public Class Test{
//获取list集合中单个属性:比如获取id
List<Object> list = new ArrayList<>();
List<Integer> ids = list.stream().map(Object::getId).collect(Collectors.toList());
//foreach循环获取
List<Integer> ids2 = new ArrayList<>();
list.stream().forEach(i -> {
int a = i.getId();
ids.add(a);
String b = i.getName();
}
}