fork download
copy 
  1. import java.util.concurrent.CopyOnWriteArraySet;
  2.  
  3. class Ideone {
  4.   public static void main(String[] args) {
  5.     final CopyOnWriteArraySet<Foo> foos = new CopyOnWriteArraySet<>();
  6.     final Foo foo = new Foo();
  7.     foos.add(foo);
  8.     System.out.println(foos.size());
  9.     foos.add(foo);
  10.     System.out.println(foos.size());
  11.   }
  12. }
  13.  
  14. class Foo {
  15.   @Override
  16.   public boolean equals(Object o) {
  17.     return false;
  18.   }
  19. }
Success #stdin #stdout 0.08s 47032KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
1
2
https://ideone.com/iDnhOb
language:
Java (HotSpot 12)
created:
2 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!