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#BAEL-18410 add code sample for reduce with complex objects

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Alessio Stalla
2019-11-09 15:06:10 +01:00
parent 12962fb016
commit bb7c57f428
5 changed files with 101 additions and 1 deletions
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27
core-java-modules/core-java-8/src/test/java/com/baeldung/streamreduce/tests/StreamReduceManualTest.java
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@@ -1,5 +1,7 @@
package com.baeldung.streamreduce.tests;
import com.baeldung.streamreduce.entities.Rating;
import com.baeldung.streamreduce.entities.Review;
import com.baeldung.streamreduce.entities.User;
import com.baeldung.streamreduce.utilities.NumberUtils;
import java.util.ArrayList;
@@ -64,6 +66,31 @@ public class StreamReduceManualTest {
assertThat(result).isEqualTo(65);
}
@Test
public void givenUserList_whenReduceWithGreaterAgeAccumulator_thenFindsOldest() {
List<User> users = Arrays.asList(new User("John", 30), new User("Alex", 40), new User("Julie", 35));
User oldest = users.stream().reduce(users.get(0), (user1, user2) -> user1.getAge() >= user2.getAge() ? user1 : user2);
assertThat(oldest).isEqualTo(users.get(1));
}
@Test
public void givenUserListWithRatings_whenReduceWithGreaterAgeAccumulator_thenFindsOldest() {
User john = new User("John", 30);
john.getRating().add(new Review(5, ""));
john.getRating().add(new Review(3, "not bad"));
User julie = new User("Julie", 35);
john.getRating().add(new Review(4, "great!"));
john.getRating().add(new Review(2, "terrible experience"));
john.getRating().add(new Review(4, ""));
List<User> users = Arrays.asList(john, julie);
Rating averageRating = users.stream().reduce(new Rating(), (rating, user) -> Rating.average(rating, user.getRating()), Rating::average);
assertThat(averageRating.getPoints()).isEqualTo(3.6);
}
@Test
public void givenStringList_whenReduceWithParallelStream_thenCorrect() {
List<String> letters = Arrays.asList("a", "b", "c", "d", "e");