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add CollStreamUtil

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Looly
2024-09-29 16:19:07 +08:00
parent 5c163941fe
commit ede848ed07
2 changed files with 42 additions and 1 deletions
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21
hutool-core/src/test/java/org/dromara/hutool/core/collection/CollStreamUtilTest.java
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@@ -16,10 +16,10 @@
package org.dromara.hutool.core.collection;
import org.dromara.hutool.core.map.MapUtil;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;
import org.dromara.hutool.core.map.MapUtil;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
@@ -320,6 +320,25 @@ public class CollStreamUtilTest {
}
}
@Test
void cartesianProductTest() {
final List<List<Object>> sets = new ArrayList<>();
sets.add(ListUtil.of(10, 20));
sets.add(ListUtil.of("John", "Jack"));
sets.add(ListUtil.of('I', 'J'));
final List<List<Object>> collect = CollStreamUtil.cartesianProduct(sets, 0).collect(Collectors.toList());
Assertions.assertEquals(8, collect.size());
Assertions.assertEquals("[10, John, I]", collect.get(0).toString());
Assertions.assertEquals("[10, John, J]", collect.get(1).toString());
Assertions.assertEquals("[10, Jack, I]", collect.get(2).toString());
Assertions.assertEquals("[10, Jack, J]", collect.get(3).toString());
Assertions.assertEquals("[20, John, I]", collect.get(4).toString());
Assertions.assertEquals("[20, John, J]", collect.get(5).toString());
Assertions.assertEquals("[20, Jack, I]", collect.get(6).toString());
Assertions.assertEquals("[20, Jack, J]", collect.get(7).toString());
}
/**
* 班级类
*/