如何在Java中的列表中保留两个不同的对象？

Question

I want to create list and I have two different objects like employee and user .If I need employee and user object both into the list. Where will write the employee object and where will write user object . How to make different objects list view.

Answer 1

I am certain that there is a better way to achieve what you want. Try writing down what you need to do, and think of ways to store the different objects.

However, to directly answer your question you can make a generic list of Object like so:

List<Object> myList = new ArrayList<Object>();
myList.add(employee);
myList.add(user);

Beware that this will store any type of object, so whenever you take things back out of the list you will need to check what sort of object it is and then cast it like so:

if (myList.get(x) instanceof Employee)
{
    //Cast to an Employee and then do whatever you want
    Employee fromList = (Employee)myList.get(x);
}
else if (myList.get(x) instanceof User)
{
    //Cast to an User and then do whatever you want
    User fromList = (User)myList.get(x);
}