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增加泛型集合向上、向下转型

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章福来
2022-05-10 09:47:08 +08:00
parent 3df525409b
commit fb79f437ab
2 changed files with 121 additions and 0 deletions
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31
hutool-core/src/test/java/cn/hutool/core/collection/CollUtilTest.java
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@@ -10,6 +10,7 @@ import lombok.Data;
import org.junit.Assert;
import org.junit.Test;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
@@ -908,6 +909,36 @@ public class CollUtilTest {
Assert.assertEquals("bb", distinct.get(1).getName());
}
@Test
public void testCastToSuper() {
Collection<Integer> collection=CollUtil.newLinkedList(1,2,3);
List<Integer> list = CollUtil.newArrayList(1, 2, 3);
Set<Integer> set = CollUtil.newHashSet(1, 2, 3);
Map<Integer, Integer> map = new HashMap<>();
map.put(1, 1);
Collection<Number> collection2 = CollUtil.castup(collection);
Assert.assertSame(collection, collection2);
Collection<Integer> collection3 = CollUtil.castdown(collection2);
Assert.assertSame(collection2, collection3);
List<Number> list2 = CollUtil.castup(list);
Assert.assertSame(list, list2);
List<Integer> list3 = CollUtil.castdown(list2);
Assert.assertSame(list2, list3);
Set<Number> set2 = CollUtil.castup(set);
Assert.assertSame(set, set2);
Set<Integer> set3 = CollUtil.castdown(set2);
Assert.assertSame(set2, set3);
Map<Number, Serializable> map2 = CollUtil.castup(map);
Assert.assertSame(map, map2);
Map<Integer, Number> map3 = CollUtil.castdown(map2);
Assert.assertSame(map2, map3);
}
@Data
@AllArgsConstructor
static class Person {