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press0@gmail.com 2022-10-08 22:30:21 -05:00
parent 1ad0c04839
commit 5eab831bb5
1 changed files with 18 additions and 17 deletions
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29
core-java-modules/core-java-collections-maps-2/src/main/java/com/baeldung/map/mapmax/MapMax.java
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@ -1,6 +1,7 @@
package com.baeldung.map.mapmax;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
@ -25,48 +26,48 @@ public class MapMax {
public <K, V extends Comparable<V>> V maxUsingCollectionsMax(Map<K, V> map) {
Entry<K, V> maxEntry = Collections.max(map.entrySet(), Entry.comparingByValue());
Entry<K, V> maxEntry = Collections.max(map.entrySet(), new Comparator<Entry<K, V>>() {
public int compare(Entry<K, V> e1, Entry<K, V> e2) {
return e1.getValue()
.compareTo(e2.getValue());
}
});
return maxEntry.getValue();
}
public <K, V extends Comparable<V>> V maxUsingCollectionsMaxAndLambda(Map<K, V> map) {
Entry<K, V> maxEntry = Collections.max(map.entrySet(), Entry.comparingByValue());
Entry<K, V> maxEntry = Collections.max(map.entrySet(), (Entry<K, V> e1, Entry<K, V> e2) -> e1.getValue()
.compareTo(e2.getValue()));
return maxEntry.getValue();
}
public <K, V extends Comparable<V>> V maxUsingCollectionsMaxAndMethodReference(Map<K, V> map) {
Entry<K, V> maxEntry = Collections.max(map.entrySet(), Entry.comparingByValue());
Entry<K, V> maxEntry = Collections.max(map.entrySet(), Comparator.comparing(Map.Entry::getValue));
return maxEntry.getValue();
}
public <K, V extends Comparable<V>> V maxUsingStreamAndLambda(Map<K, V> map) {
Optional<Entry<K, V>> maxEntry = map.entrySet()
.stream()
.max(Entry.comparingByValue());
.max((Entry<K, V> e1, Entry<K, V> e2) -> e1.getValue()
.compareTo(e2.getValue()));
return maxEntry.get()
.getValue();
return maxEntry.get().getValue();
}
public <K, V extends Comparable<V>> V maxUsingStreamAndMethodReference(Map<K, V> map) {
Optional<Entry<K, V>> maxEntry = map.entrySet()
.stream()
.max(Entry.comparingByValue());
.max(Comparator.comparing(Map.Entry::getValue));
return maxEntry.get()
.getValue();
}
public static void main(String[] args) {
Map<Integer, Integer> map = new HashMap<>();
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
map.put(1, 3);
map.put(2, 4);