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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		List<? extends Number> numberList = new ArrayList<>();
  10.         List<?> anotherList = numberList; // OK
  11.  
  12.         Map<String, List<? extends Number>> numberMap = new HashMap<>();
  13.         Map<String, List<?>> anotherMap = numberMap; // ERROR
  14. 	}
  15. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:13: error: incompatible types: Map<String,List<? extends Number>> cannot be converted to Map<String,List<?>>
        Map<String, List<?>> anotherMap = numberMap; // ERROR
                                          ^
1 error
stdout
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Standard output is empty
https://ideone.com/AZgV9H
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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