testMoreEfficientCopyOnWriteList [1034558]

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JavaX fragment (include) [tags: use-pretranspiled]

svoid testMoreEfficientCopyOnWriteList() {
  new MoreEfficientCopyOnWriteList<Int> l;
  var it = l.iterator();
  l.add(5);
  assertEquals(ll(), asList(it));
  it = l.iterator();
  l.add(0, 10);
  assertEquals(ll(5), asList(it));
  assertEquals(ll(10, 5), asList(l.iterator()));
  
  // make sure this doesn't take O(n^2) time
  time "My list" { repeat 20000 { l.add(0); } }
  
  // ...while this does
  new CopyOnWriteArrayList<Int> l2;
  time "Their list" { repeat 20000 { l2.add(0); } }
}

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Snippet ID:

#1034558

Snippet name:

testMoreEfficientCopyOnWriteList

Eternal ID of this version:

#1034558/3

Text MD5:

7ec3a38e58d3b863fa35df03a1ac31ab

Transpilation MD5:

820890cb0d72042b833fcf355f252687

Author:

stefan

Category:

javax / collections

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2022-02-13 18:43:32

Source code size:

506 bytes / 17 lines

Pitched / IR pitched:

No / No

Views / Downloads:

355 / 456

Version history:

2 change(s)

Referenced in:

[show references]

1	svoid testMoreEfficientCopyOnWriteList() {
2	new MoreEfficientCopyOnWriteList<Int> l;
3	var it = l.iterator();
4	l.add(5);
5	assertEquals(ll(), asList(it));
6	it = l.iterator();
7	l.add(0, 10);
8	assertEquals(ll(5), asList(it));
9	assertEquals(ll(10, 5), asList(l.iterator()));
10
11	// make sure this doesn't take O(n^2) time
12	time "My list" { repeat 20000 { l.add(0); } }
13
14	// ...while this does
15	new CopyOnWriteArrayList<Int> l2;
16	time "Their list" { repeat 20000 { l2.add(0); } }
17	}