这是indexloc提供的服务，不要输入任何密码
Skip to content

[BAEL-8736] by sgrverma23: Java Guide to verify if all values in map are same #17884

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 6 commits into from
Nov 16, 2024
Merged

[BAEL-8736] by sgrverma23: Java Guide to verify if all values in map are same #17884

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
6 commits
Select commit Hold shift + click to select a range
ecbdf66
BAEL-8736: sgrverma23 - Java Guide to verify map values
sgrverma23 Oct 26, 2024
4120e1d
BAEL-8736: sgrverma23 - refactoring junit class name and methods
sgrverma23 Nov 2, 2024
1b5c3e9
BAEL-8736: sgrverma23 - moving code to existing core-java-collections…
sgrverma23 Nov 3, 2024
6afe426
BAEL-8736: sgrverma23 - refactoring package name
sgrverma23 Nov 3, 2024
3784bb9
BAEL-8736: sgrverma23 - refactoring logic to check all values are same
sgrverma23 Nov 9, 2024
0f6dbb9
trigger build
sgrverma23 Nov 9, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
38 changes: 38 additions & 0 deletions ...a-collections-maps-8/src/main/java/com/baeldung/map/maptruevaluecheck/MapValuesCheck.java
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,38 @@
package com.baeldung.map.maptruevaluecheck;

import java.util.Map;
import java.util.HashSet;
import java.util.Set;

public class MapValuesCheck {

public static boolean areAllValuesSameWithReduce(Map<String, Integer> map) {
if (map.isEmpty()) return true;
int firstValue = map.values().iterator().next();
return map.values().stream().reduce(true,
(result, value) -> result && value.equals(firstValue),
Boolean::logicalAnd);
}

public static boolean areAllValuesSameWithSet(Map<String, Integer> map) {
Set<Integer> uniqueValues = new HashSet<>(map.values());
return uniqueValues.size() == 1;
}

public static boolean areAllValuesSameWithAllMatch(Map<String, Integer> map) {
if (map.isEmpty()) return true;
int firstValue = map.values().iterator().next();
return map.values().stream().allMatch(value -> value.equals(firstValue));
}

public static boolean areAllValuesSameWithLoop(Map<String, Integer> map) {
if (map.isEmpty()) return true;
int firstValue = map.values().iterator().next();
for (int value : map.values()) {
if (value != firstValue) {
return false;
}
}
return true;
}
}
49 changes: 49 additions & 0 deletions ...tions-maps-8/src/test/java/com/baeldung/map/maptruevaluecheck/MapValuesCheckUnitTest.java
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,49 @@
package com.baeldung.map.maptruevaluecheck;

import org.junit.jupiter.api.Test;
import java.util.Map;
import static org.junit.jupiter.api.Assertions.*;

public class MapValuesCheckUnitTest {

@Test
public void givenMapWithAllSameValues_whenCheckAllValuesSame_thenReturnTrue() {
Map<String, Integer> map = Map.of("English", 100, "Maths", 100, "Science", 100);

assertTrue(MapValuesCheck.areAllValuesSameWithAllMatch(map));
assertTrue(MapValuesCheck.areAllValuesSameWithReduce(map));
assertTrue(MapValuesCheck.areAllValuesSameWithLoop(map));
}

@Test
public void givenMapWithDifferentValues_whenCheckAllValuesSame_thenReturnFalse() {
Map<String, Integer> map = Map.of("English", 1000, "Maths", 100, "Science", 100);

assertFalse(MapValuesCheck.areAllValuesSameWithAllMatch(map));
assertFalse(MapValuesCheck.areAllValuesSameWithReduce(map));
assertFalse(MapValuesCheck.areAllValuesSameWithLoop(map));
}

@Test
public void givenEmptyMap_whenCheckAllValuesSame_thenReturnTrue() {
Map<String, Integer> map = Map.of();

assertTrue(MapValuesCheck.areAllValuesSameWithAllMatch(map));
assertTrue(MapValuesCheck.areAllValuesSameWithReduce(map));
assertTrue(MapValuesCheck.areAllValuesSameWithLoop(map));
}

@Test
void givenMapWithAllSameValues_whenCheckingAllValuesSameWithSet_thenReturnTrue() {
Map<String, Integer> map = Map.of("English", 100, "Maths", 100, "Science", 100);

assertTrue(MapValuesCheck.areAllValuesSameWithSet(map));
}

@Test
void givenMapWithDifferentValues_whenCheckingAllValuesSameWithSet_thenReturnFalse() {
Map<String, Integer> map = Map.of("English", 1000, "Maths", 100, "Science", 100);

assertFalse(MapValuesCheck.areAllValuesSameWithSet(map));
}
}