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CollUtil.unionAll优化：初始化一次size，防止ArrayList多次扩容

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青韵
2022-09-26 21:33:49 +08:00
parent ec5965f49c
commit 0b8c4bbad0
2 changed files with 75 additions and 15 deletions
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48
hutool-core/src/test/java/cn/hutool/core/collection/CollUtilTest.java
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@@ -940,6 +940,54 @@ public class CollUtilTest {
final List<String> list3 = null;
final List<String> list = CollUtil.unionAll(list1, list2, list3);
Assert.assertNotNull(list);
final List<String> resList2 = CollUtil.unionAll(null, null, null);
Assert.assertNotNull(resList2);
}
@Test
public void unionAllOrdinaryTest() {
final List<Integer> list1 = CollectionUtil.newArrayList(1, 2, 2, 3, 3);
final List<Integer> list2 = CollectionUtil.newArrayList(1, 2, 3);
final List<Integer> list3 = CollectionUtil.newArrayList(4, 5, 6);
final List<Integer> list = CollUtil.unionAll(list1, list2, list3);
Assert.assertNotNull(list);
Assert.assertArrayEquals(
CollectionUtil.newArrayList(1, 2, 2, 3, 3, 1, 2, 3, 4, 5, 6).toArray(),
list.toArray());
}
@Test
public void unionAllTwoOrdinaryTest() {
final List<Integer> list1 = CollectionUtil.newArrayList(1, 2, 2, 3, 3);
final List<Integer> list2 = CollectionUtil.newArrayList(1, 2, 3);
final List<Integer> list = CollUtil.unionAll(list1, list2);
Assert.assertNotNull(list);
Assert.assertArrayEquals(
CollectionUtil.newArrayList(1, 2, 2, 3, 3, 1, 2, 3).toArray(),
list.toArray());
}
@Test
public void unionAllOtherIsNullTest() {
final List<Integer> list1 = CollectionUtil.newArrayList(1, 2, 2, 3, 3);
final List<Integer> list2 = CollectionUtil.newArrayList(1, 2, 3);
final List<Integer> list = CollUtil.unionAll(list1, list2, null);
Assert.assertNotNull(list);
Assert.assertArrayEquals(
CollectionUtil.newArrayList(1, 2, 2, 3, 3, 1, 2, 3).toArray(),
list.toArray());
}
@Test
public void unionAllOtherTwoNullTest() {
final List<Integer> list1 = CollectionUtil.newArrayList(1, 2, 2, 3, 3);
final List<Integer> list2 = CollectionUtil.newArrayList(1, 2, 3);
final List<Integer> list = CollUtil.unionAll(list1, list2, null, null);
Assert.assertNotNull(list);
Assert.assertArrayEquals(
CollectionUtil.newArrayList(1, 2, 2, 3, 3, 1, 2, 3).toArray(),
list.toArray());
}
@Test