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simplify with comparingByValue()

This commit is contained in:
press0@gmail.com 2022-10-08 21:41:57 -05:00
parent c18ce8a0cf
commit 027cbaf9f9
1 changed files with 9 additions and 7 deletions
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16
core-java-modules/core-java-collections-maps-2/src/main/java/com/baeldung/map/mapmax/MapMax.java
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@ -1,7 +1,11 @@
package com.baeldung.map.mapmax; package com.baeldung.map.mapmax;
import java.util.*; import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry; import java.util.Map.Entry;
import java.util.Optional;
public class MapMax { public class MapMax {
@ -34,15 +38,14 @@ public class MapMax {
public <K, V extends Comparable<V>> V maxUsingCollectionsMaxAndLambda(Map<K, V> map) { public <K, V extends Comparable<V>> V maxUsingCollectionsMaxAndLambda(Map<K, V> map) {
Entry<K, V> maxEntry = Collections.max(map.entrySet(), (Entry<K, V> e1, Entry<K, V> e2) -> e1.getValue() Entry<K, V> maxEntry = Collections.max(map.entrySet(), Entry.comparingByValue());
.compareTo(e2.getValue()));
return maxEntry.getValue(); return maxEntry.getValue();
} }
public <K, V extends Comparable<V>> V maxUsingCollectionsMaxAndMethodReference(Map<K, V> map) { public <K, V extends Comparable<V>> V maxUsingCollectionsMaxAndMethodReference(Map<K, V> map) {
Entry<K, V> maxEntry = Collections.max(map.entrySet(), Comparator.comparing(Map.Entry::getValue)); Entry<K, V> maxEntry = Collections.max(map.entrySet(), Entry.comparingByValue());
return maxEntry.getValue(); return maxEntry.getValue();
} }
@ -51,8 +54,7 @@ public class MapMax {
Optional<Entry<K, V>> maxEntry = map.entrySet() Optional<Entry<K, V>> maxEntry = map.entrySet()
.stream() .stream()
.max((Entry<K, V> e1, Entry<K, V> e2) -> e1.getValue() .max(Entry.comparingByValue());
.compareTo(e2.getValue()));
return maxEntry.get() return maxEntry.get()
.getValue(); .getValue();
@ -62,7 +64,7 @@ public class MapMax {
Optional<Entry<K, V>> maxEntry = map.entrySet() Optional<Entry<K, V>> maxEntry = map.entrySet()
.stream() .stream()
.max(Comparator.comparing(Map.Entry::getValue)); .max(Entry.comparingByValue());
return maxEntry.get() return maxEntry.get()
.getValue(); .getValue();