Sort the map in ascending and decreasing order based on the key and value.
Approach: Using java 8- ascending sorting on a key basis
import java.util.HashMap;import java.util.LinkedHashMap;import java.util.Map;import java.util.stream.Collectors;public class MapSort {public static void main(String[] args) {HashMap<String, Integer> map = new HashMap<String, Integer>();map.put("B", 2);map.put("D", 4);map.put("G", 7);map.put("A", 1);// sort the map using keyHashMap<String, Integer> mp = map.entrySet().stream().sorted(Map.Entry.comparingByKey()).collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue,(o1V, o2V) -> o1V, LinkedHashMap::new));// print hashmapmp.forEach((K, V) -> System.out.println(K + " " + V));}}
Approach: Using java 8- ascending sorting on a key basis
import java.util.HashMap;import java.util.LinkedHashMap;import java.util.Map;import java.util.stream.Collectors;public class MapSort {public static void main(String[] args) {HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();map.put(2, 2);map.put(4, 4);map.put(7, 7);map.put(1, 1);// sort the map using keyHashMap<Integer, Integer> mp = map.entrySet().stream().sorted(Map.Entry.comparingByKey()).collect(Collectors.toMap(Map.Entry::getKey,Map.Entry::getValue, (o1V, o2V) -> o1V, LinkedHashMap::new));// print hashmapmp.forEach((K, V) -> System.out.println(K + " " + V));}}
Approach: Using java 8- descending sorting on a key basis
import java.util.Comparator;import java.util.HashMap;import java.util.LinkedHashMap;import java.util.Map;import java.util.stream.Collectors;public class MapSort {public static void main(String[] args) {HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();map.put(2, 2);map.put(4, 4);map.put(7, 7);map.put(1, 1);// sort the map using keyHashMap<Integer, Integer> mp = map.entrySet().stream().sorted(Map.Entry.comparingByKey(Comparator.reverseOrder())).collect(Collectors.toMap(Map.Entry::getKey,Map.Entry::getValue, (o1V, o2V) -> o1V, LinkedHashMap::new));// print hashmapmp.forEach((K, V) -> System.out.println(K + " " + V));}}
Approach: Using java 8- ascending sorting on a value basis
import java.util.Comparator;import java.util.HashMap;import java.util.LinkedHashMap;import java.util.Map;import java.util.stream.Collectors;public class MapSort {public static void main(String[] args) {HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();map.put(2, 4);map.put(4, 2);map.put(7, 8);map.put(1, 3);// sort the map using valueHashMap<Integer, Integer> mp = map.entrySet().stream().sorted(Map.Entry.comparingByValue()).collect(Collectors.toMap(Map.Entry::getKey,Map.Entry::getValue, (o1V, o2V) -> o1V, LinkedHashMap::new));// print hashmapmp.forEach((K, V) -> System.out.println(K + " " + V));}}
Approach: Using java 8- descending sorting on a value basis
import java.util.Comparator;import java.util.HashMap;import java.util.LinkedHashMap;import java.util.Map;import java.util.stream.Collectors;public class MapSort {public static void main(String[] args) {HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();map.put(2, 4);map.put(4, 2);map.put(7, 8);map.put(1, 3);// sort the map using valueHashMap<Integer, Integer> mp = map.entrySet().stream().sorted(Map.Entry.comparingByValue(Comparator.reverseOrder())).collect(Collectors.toMap(Map.Entry::getKey,Map.Entry::getValue, (o1V, o2V) -> o1V, LinkedHashMap::new));// print hashmapmp.forEach((K, V) -> System.out.println(K + " " + V));}}
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