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I tried to run the below code 

List<? extends Object> list = new ArrayList<Integer>();
list.add(1); //compile error
list.add("abb");//compile error

I understand we can't add anything to above list. Then what is the purpose of creating a list in this way ?

What is the reason java allowed us to create a list this way ?

Thanks

Manish
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  • Wildcards should only really be used in method parameters to make the API accept a broader range of inputs. You should only rarely use them as local variables or fields. – Andy Turner Jul 03 '18 at 18:06
  • "I understand we can't add anything to above list." Not true, you can add `null`. – Andy Turner Jul 03 '18 at 18:07

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