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Commit 69fcbcc

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sortByValues
1 parent 3cd747f commit 69fcbcc

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1 file changed

+34
-7
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1 file changed

+34
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‎src/test/java/MapComparingTest.java‎

Lines changed: 34 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -1,10 +1,7 @@
11
import com.google.common.collect.ImmutableSet;
22
import org.junit.Test;
33

4-
import java.util.Arrays;
5-
import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.*;
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import java.util.stream.Collectors;
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import static org.hamcrest.CoreMatchers.is;
@@ -49,7 +46,7 @@ public void sortByKeys_reverse() {
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personMap.put(p3.getId(), p3);
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List<Integer> ids = personMap.entrySet().stream()
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.sorted(Map.Entry.<Integer, Person>comparingByKey().reversed())
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.sorted(Map.Entry.comparingByKey((x, y) -> Integer.compare(y, x)))
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.map(Map.Entry::getKey)
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.collect(Collectors.toList());
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@@ -58,11 +55,41 @@ public void sortByKeys_reverse() {
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@Test
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public void sortByValues_compareBySetSize() {
61-
new Person(1, ImmutableSet.of("A", "B", "C"));
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Person p1 = new Person(1, ImmutableSet.of("1", "2", "3"));
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Person p2 = new Person(2, ImmutableSet.of("1", "2", "3", "4"));
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Person p3 = new Person(3, ImmutableSet.of("3"));
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Map<Integer, Person> personMap = new HashMap<>();
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personMap.put(p1.getId(), p1);
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personMap.put(p2.getId(), p2);
66+
personMap.put(p3.getId(), p3);
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68+
List<Integer> ids = personMap.entrySet().stream()
69+
.sorted(Map.Entry.comparingByValue(Comparator.comparingInt(p -> p.getHobbies().size())))
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.map(Map.Entry::getKey)
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.collect(Collectors.toList());
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assertThat(ids, is(Arrays.asList(3, 1, 2)));
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}
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@Test
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public void sortByValues_compareBySetSize_reverse() {
66-
new Person(1, ImmutableSet.of("A", "B", "C"));
78+
Person p1 = new Person(1, ImmutableSet.of("1", "2", "3"));
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Person p2 = new Person(2, ImmutableSet.of("1", "2", "3", "4"));
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Person p3 = new Person(3, ImmutableSet.of("3"));
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Map<Integer, Person> personMap = new HashMap<>();
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personMap.put(p1.getId(), p1);
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personMap.put(p2.getId(), p2);
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personMap.put(p3.getId(), p3);
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88+
List<Integer> ids = personMap.entrySet().stream()
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.sorted(Map.Entry.comparingByValue(Comparator.<Person>comparingInt(p -> p.getHobbies().size()).reversed()))
90+
.map(Map.Entry::getKey)
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.collect(Collectors.toList());
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assertThat(ids, is(Arrays.asList(2, 1, 3)));
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}
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}

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