List Object or Just List which is better ?

Hi Guys,
List<Object> list1 = new ArrayList<Object>();
List list2 = new ArrayList();Logically speaking, both looks similiar. But which one is better to use ?
I can do something like
list1 = list2; OR
list2 = list1; but if List<String> list3 = new ArrayList<String>();Why I can not do this list1 = list3; // throws compilation error Thanks,
javaCrazy

javaCrazy wrote:
List<Object> list1 = new ArrayList<Object>(); This is senseless. Inside the braces an appropriate Interface should be used.
but if List<String> list3 = new ArrayList<String>(); Why I can not do this list1 = list3; // throws compilation error
If you declare <tt>List<String> list3 = new ArrayList<String>();</tt> you explicity state that the List will only contain Strings (or types that inherit from the declared type, but String cannot be subclassed), list1 is declared to contain objects of a different kind. Usually the interface of the type list1 is declare will not match with the interface declared for the elements in list3. Since Object is the root of all classes this is a weird exception... Thats why the compiler prohibits this assignment. If you really need such assignment look for the use of wildcards.
bye
TPD

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