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  1. import java.util.*;
  2.  
  3. class Example {
  4.     public static void main(String[] args) {
  5.         List<String> list = new ArrayList<>();
  6.         list.add("Abc");
  7.  
  8.         Collection<?> c = list;
  9.         addSelf(c);
  10.         System.out.println(c);
  11.     }
  12.  
  13.     static <T> void addSelf(Collection<T> c) {
  14.         c.addAll(new ArrayList<>(c));
  15.     }
  16. }
Success #stdin #stdout 0.06s 2184192KB
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Standard input is empty
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[Abc, Abc]
https://ideone.com/xmlmWP
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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