java sort map by values

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Jonah
26 Nov 2017
1Map<String, Integer> unSortedMap = getUnSortedMap();
2         
3System.out.println("Unsorted Map : " + unSortedMap);
4 
5//LinkedHashMap preserve the ordering of elements in which they are inserted
6LinkedHashMap<String, Integer> sortedMap = new LinkedHashMap<>();
7 
8unSortedMap.entrySet()
9    .stream()
10    .sorted(Map.Entry.comparingByValue())
11    .forEachOrdered(x -> sortedMap.put(x.getKey(), x.getValue()));
12 
13System.out.println("Sorted Map   : " + sortedMap);
14 
15Output:
16 
17Unsorted Map : {alex=1, charles=4, david=2, brian=5, elle=3}
18Sorted Map   : {alex=1, david=2, elle=3, charles=4, brian=5}
19
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Edoardo
28 Feb 2020
1//----------------------------------------------------------------------
2// in ascending order:
3Map<String, Integer> unSortedMap = getUnSortedMap();
4         
5System.out.println("Unsorted Map : " + unSortedMap);
6 
7//LinkedHashMap preserve the ordering of elements in which they are inserted
8LinkedHashMap<String, Integer> sortedMap = new LinkedHashMap<>();
9 
10unSortedMap.entrySet()
11    .stream()
12    .sorted(Map.Entry.comparingByValue())
13    .forEachOrdered(x -> sortedMap.put(x.getKey(), x.getValue()));
14 
15System.out.println("Sorted Map   : " + sortedMap);
16 
17Output:
18 
19Unsorted Map : {alex=1, charles=4, david=2, brian=5, elle=3}
20Sorted Map   : {alex=1, david=2, elle=3, charles=4, brian=5}
21
22
23//----------------------------------------------------------------------
24// in descending order:
25Map<String, Integer> unSortedMap = getUnSortedMap();
26         
27System.out.println("Unsorted Map : " + unSortedMap);
28 
29//LinkedHashMap preserve the ordering of elements in which they are inserted
30LinkedHashMap<String, Integer> reverseSortedMap = new LinkedHashMap<>();
31 
32//Use Comparator.reverseOrder() for reverse ordering
33unSortedMap.entrySet()
34    .stream()
35    .sorted(Map.Entry.comparingByValue(Comparator.reverseOrder())) 
36    .forEachOrdered(x -> reverseSortedMap.put(x.getKey(), x.getValue()));
37 
38System.out.println("Reverse Sorted Map   : " + reverseSortedMap);
39 
40Output:
41 
42Unsorted Map        : {alex=1, charles=4, david=2, brian=5, elle=3}
43Reverse Sorted Map  : {brian=5, charles=4, elle=3, david=2, alex=1}
44
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