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处理Collectors遇到null的情况

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achao
2022-07-03 17:35:54 +08:00
committed by VampireAchao
parent 8af05e0892
commit 9538041ac5
2 changed files with 8 additions and 3 deletions
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4
hutool-core/src/test/java/cn/hutool/core/collection/CollStreamUtilTest.java
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@@ -153,7 +153,7 @@ public class CollStreamUtilTest {
// 对null友好
final Map<Long, Map<Long, Student>> termIdClassIdStudentMap = CollStreamUtil.group2Map(Arrays.asList(null, new Student(2, 2, 1, "王五")), Student::getTermId, Student::getClassId);
final Map<Long, Map<Long, Student>> termIdClassIdStudentCompareMap = new HashMap<Long, Map<Long, Student>>() {{
put(null, MapUtil.of(null, null));
put(null, MapUtil.empty());
put(2L, MapUtil.of(2L, new Student(2, 2, 1, "王五")));
}};
Assert.assertEquals(termIdClassIdStudentCompareMap, termIdClassIdStudentMap);
@@ -215,7 +215,7 @@ public class CollStreamUtilTest {
new Student(1, 2, 1, "李四"));
final Map<Long, List<Student>> termIdStudentsMap = CollStreamUtil.groupBy(students, Student::getTermId, Collectors.toList());
final Map<Long, List<Student>> termIdStudentsCompareMap = new HashMap<>();
termIdStudentsCompareMap.put(null, Arrays.asList(null, null));
termIdStudentsCompareMap.put(null, Collections.emptyList());
termIdStudentsCompareMap.put(1L, Arrays.asList(new Student(1L, 1, 1, "张三"), new Student(1L, 2, 1, "李四")));
Assert.assertEquals(termIdStudentsCompareMap, termIdStudentsMap);