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The sort index of the point inside the treemap level.
A TreeMap is always sorted based on its keys, however if you want to sort it based on its values then you can build a logic to do this using comparator. Below is a complete code of sorting a TreeMap by values.
import java.util.*; class TreeMapDemo { //Method for sorting the TreeMap based on values public static <K, V extends Comparable<V>> Map<K, V> sortByValues(final Map<K, V> map) { Comparator<K> valueComparator = new Comparator<K>() { public int compare(K k1, K k2) { int compare = map.get(k1).compareTo(map.get(k2)); if (compare == 0) return 1; else return compare; } }; Map<K, V> sortedByValues = new TreeMap<K, V>(valueComparator); sortedByValues.putAll(map); return sortedByValues; } public static void main(String args[]) { TreeMap<String, String> treemap = new TreeMap<String, String>(); // Put elements to the map treemap.put("Key1", "Jack"); treemap.put("Key2", "Rick"); treemap.put("Key3", "Kate"); treemap.put("Key4", "Tom"); treemap.put("Key5", "Steve"); // Calling the method sortByvalues Map sortedMap = sortByValues(treemap); // Get a set of the entries on the sorted map Set set = sortedMap.entrySet(); // Get an iterator Iterator i = set.iterator(); // Display elements while(i.hasNext()) { Map.Entry me = (Map.Entry)i.next(); System.out.print(me.getKey() + ": "); System.out.println(me.getValue()); } } }
Output:
Key1: Jack Key3: Kate Key2: Rick Key5: Steve Key4: Tom
TreeMap is a map implementation that keeps its entry sorted according to the natural ordering of its keys. So, for an integer, this would mean ascending order, and for string, it would be alphabetical order. TreeMap can also be sorted according to the user by using a comparator at construction time.
Here we are going to see how to print TreeMap having custom class objects as keys or values. But before that, let’s see exactly what happens when trying to print it normally. While trying to print object directly printed value might not be in proper format and in multiple cases garbage values like @agc1243 print at the output.
Normal Printing implementation:
Java
import java.io.*;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
1
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
3
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
4
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
3
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
7
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
9 `import`0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`import`2
`import`3`import`4`import`5
`import`3`import`4`import`8
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`java.io.*; `0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
9 `java.io.; `3`java.io.; `4 `java.io.*; `5
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
9 `java.io.; `8`java.io.; `4 `import`0
`java.io.*; `0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
0 `import`3
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
9 `import`6 `import`7 `import`8
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`import`2
`import`3`java.util.Map; `2
`java.util.Map; `3`java.util.Map; `4`java.util.Map; `5 `java.util.Map; `6
`import`3`java.util.Map; `8`java.util.Map; `9`import`0`java.util.Map; `5 `import`2`import`3`import`0`import`5`import`6
`import`3`java.util.Map; `8`import`9`import`0`java.util.Map; `5 `import`2`java.util.Set; `3`import`0`java.util.Set; `5`import`6
`import`3`java.util.Map; `8`java.util.Set; `9`import`0`java.util.Map; `5 `import`2`import`3`import`0`import`5`import`6
`import`3`import`8
`java.util.Map; `3`java.util.TreeMap; `0
`import`3`java.util.TreeMap; `2 `java.util.TreeMap; `3
`java.util.Map; `3`java.util.TreeMap; `5`java.util.TreeMap; `6
`java.util.TreeMap; `7`java.util.TreeMap; `8
`import`3`java.io.*; `0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`java.io.*; `0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
03
Output
1=>Student@3941a79c 2=>Student@506e1b77 3=>Student@4fca772d
The reason why the output is not in the proper format?
The reason is our Student class has not overridden the toString method from the Object class. So that is why the toString method of the Object class is used here which prints “class_name@object_hashcode” when an object is printed.
So, the next question is How to fix this?
To fix this, override the toString method in our Student class.
Implementation:
Java
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
1
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
3
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
4
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
3
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
7
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
9 `import`0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`import`2
`import`3`import`4`import`5
`import`3`import`4`import`8
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`java.io.*; `0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
9 `java.io.; `3`java.io.; `4 `java.io.*; `5
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
9 `java.io.; `8`java.io.; `4 `import`0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
9
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
43
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`import`2
`import`3`java.io.*; `4
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
48
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
49`import`4
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
51`java.util.TreeMap; `6
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
49`import`4
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
55
`java.util.Map; `3
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
49
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
58
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
59
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`java.io.*; `0
`java.io.*; `0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
0 `import`3
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
9 `import`6 `import`7 `import`8
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`import`2
`import`3`java.util.Map; `2
`java.util.Map; `3`java.util.Map; `4`java.util.Map; `5 `java.util.Map; `6
`import`3`java.util.Map; `8`java.util.Map; `9`import`0`java.util.Map; `5 `import`2`import`3`import`0`import`5`import`6
`import`3`java.util.Map; `8`import`9`import`0`java.util.Map; `5 `import`2`java.util.Set; `3`import`0`java.util.Set; `5`import`6
`import`3`java.util.Map; `8`java.util.Set; `9`import`0`java.util.Map; `5 `import`2`import`3`import`0`import`5`import`6
`import`3`import`8
`java.util.Map; `3`java.util.TreeMap; `0
`import`3`java.util.TreeMap; `2 `java.util.TreeMap; `3
`java.util.Map; `3`java.util.TreeMap; `5`java.util.TreeMap; `6
`java.util.TreeMap; `7`java.util.TreeMap; `8
`import`3`java.io.*; `0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
2`java.io.*; `0
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
03
Output
1=>[101=>Abhay] 2=>[102=>Sarika] 3=>[103=>Vanshika]
Note: So the main tip here to remember is to always override the toString() method in your custom classes.
Does TreeMap sort on key or value?
In Java Language, a TreeMap always stores key-value pairs which are in sorted order on the basis of the key. TreeMap implements the NavigableMap interface and extends AbstractMap class. TreeMap contains unique keys. The elements in TreeMap are sorted on the basis of keys.17 thg 12, 2020nullHow to Sort a TreeMap By Value in Java? - GeeksforGeekswww.geeksforgeeks.org › how-to-sort-a-treemap-by-value-in-javanull
Does TreeMap sort automatically?
By default, TreeMap sorts all its entries according to their natural ordering. For an integer, this would mean ascending order and for strings, alphabetical order. Notice that we placed the integer keys in a non-orderly manner but on retrieving the key set, we confirm that they are indeed maintained in ascending order.9 thg 1, 2024nullA Guide to TreeMap in Java | Baeldungwww.baeldung.com › java-treemapnull
How to change sorting order in TreeMap?
By default TreeMap elements in Java are sorted in ascending order of keys. However, we can create the TreeMap in reverse order using Collections. reverseOrder() method in Java and display the elements in descending order of keys.nullHow to create a TreeMap in reverse order in Java - GeeksforGeekswww.geeksforgeeks.org › how-to-create-a-treemap-in-reverse-order-in-javanull
How do you get the highest key
TreeMap object. To get the highest key currently stored in Java TreeMap use, Object lastKey() method of TreeMap class.nullGet lowest and highest key stored in Java TreeMap examplewww.java-examples.com › get-lowest-and-highest-key-stored-java-treemap...null