superT, extendsT

turopvin · turopvin · commit da2384a46988 · 2020-05-25T12:10:17.000+03:00
diff --git a/README.md b/README.md
@@ -66,6 +66,7 @@ At the beginning, it was the repository with questions from Java interviews. Cur
 - [How to filter list of objects using Stream API without .filter()?](core.md#howto-filter-list-of-objects-using-stream-without-filter)
 - [What is String Pool? How do Strings get there?](core.md#what-is-string-pool-how-do-strings-get-there)
 - [What is the difference between StringBuilder and StringBuffer?](core.md#what-is-the-difference-between-stringbuilder-and-stringbuffer)
+- [Difference between <? super T> and <? extends T> ?](core.md#difference-between--super-t-and--extends-t-)
 
 ## Collections
 - [What is the complexity for get in Hashmap?](collections.md#what-is-the-complexity-for-get-in-hashmap)
diff --git a/core.md b/core.md
@@ -41,6 +41,7 @@
 - [How to filter list of objects using Stream API without .filter()?](#howto-filter-list-of-objects-using-stream-without-filter)
 - [What is String Pool? How do Strings get there?](#what-is-string-pool-how-do-strings-get-there)
 - [What is the difference between StringBuilder and StringBuffer?](#what-is-the-difference-between-stringbuilder-and-stringbuffer)
+- [Difference between <? super T> and <? extends T> ?](#difference-between-superT-and-extendsT)
 
 ## What's new in Java 8?
 + Lambda expressions, Method Reference , Optional, Streams added.
@@ -300,4 +301,9 @@ String pool is the special memory region where Strings are stored by the JVM.
 ## What is the difference between StringBuilder and StringBuffer?
 All public methods of StringBuffer are synchronized, it provides Thread safety but on a performance cost.
 
+
+## Difference between <? super T> and <? extends T> ?
+###### Relative links:
+- https://stackoverflow.com/questions/4343202/difference-between-super-t-and-extends-t-in-java
+
 [Home Page](README.md)
