EN
Java - sort HashMap by values
14 points
Short solution:
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Map<String, Integer> map = new HashMap<>();2
// put key / value to map3
4
List<Map.Entry<String, Integer>> sorted = new ArrayList<>(map.entrySet());5
sorted.sort(Map.Entry.comparingByValue());6
7
// we iterate over sorted entry list8
for (Map.Entry<String, Integer> entry : sorted) {9
String key = entry.getKey();10
Integer value = entry.getValue();11
12
System.out.println("Key: " + key + ", Value : " + value);13
}Another short solution:
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Map<String, Integer> map = new HashMap<>();2
// put key / value to map3
4
map.entrySet()5
.stream()6
.sorted(Map.Entry.comparingByValue())7
.forEach(entry -> {8
String key = entry.getKey();9
Integer value = entry.getValue();10
11
System.out.println("Key: " + key + ", Value : " + value);12
});xxxxxxxxxx1
import java.util.ArrayList;2
import java.util.HashMap;3
import java.util.List;4
import java.util.Map;5
6
public class Example1 {7
8
public static void main(String[] args) {9
10
Map<String, Integer> map = new HashMap<>();11
map.put("YY", 3);12
map.put("ZZ", 4);13
map.put("CC", 2);14
map.put("AA", 1);15
16
System.out.println("Unsorted:");17
map.forEach((key, value) -> {18
System.out.println("Key: " + key + ", Value : " + value);19
});20
21
System.out.println("---------");22
23
List<Map.Entry<String, Integer>> sorted = new ArrayList<>(map.entrySet());24
sorted.sort(Map.Entry.comparingByValue());25
26
System.out.println("Sorted:");27
// we iterate over sorted entry list28
for (Map.Entry<String, Integer> entry : sorted) {29
String key = entry.getKey();30
Integer value = entry.getValue();31
32
System.out.println("Key: " + key + ", Value : " + value);33
}34
}35
}Output:
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Unsorted:2
Key: YY, Value : 33
Key: ZZ, Value : 44
Key: CC, Value : 25
Key: AA, Value : 16
---------7
Sorted:8
Key: AA, Value : 19
Key: CC, Value : 210
Key: YY, Value : 311
Key: ZZ, Value : 4xxxxxxxxxx1
import java.util.HashMap;2
import java.util.Map;3
4
public class Example2 {5
6
public static void main(String[] args) {7
8
Map<String, Integer> map = new HashMap<>();9
map.put("YY", 3);10
map.put("ZZ", 4);11
map.put("CC", 2);12
map.put("AA", 1);13
14
System.out.println("Unsorted:");15
map.forEach((key, value) -> {16
System.out.println("Key: " + key + ", Value : " + value);17
});18
19
System.out.println("---------");20
21
System.out.println("Sorted:");22
map.entrySet()23
.stream()24
.sorted(Map.Entry.comparingByValue())25
.forEach(entry -> {26
String key = entry.getKey();27
Integer value = entry.getValue();28
29
System.out.println("Key: " + key + ", Value : " + value);30
});31
}32
}Output:
xxxxxxxxxx1
Unsorted:2
Key: YY, Value : 33
Key: ZZ, Value : 44
Key: CC, Value : 25
Key: AA, Value : 16
---------7
Sorted:8
Key: AA, Value : 19
Key: CC, Value : 210
Key: YY, Value : 311
Key: ZZ, Value : 4
