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• It is another implementation class of Map interface.
• It contains values based on the key.
• It contains only unique elements.
• It cannot have null key but can have multiple null values.
• It performs sorting operation, here keys will sort, that means all keys will represent in the form of sorting order.

Let's see a program:

TreeMapDemo.java:

import java.util.*;
class TreeMapDemo
{
public static void main(String args[])
{
TreeMap<Integer,String> hm=new TreeMap<Integer,String>();
hm.put(100,"Tapuuu");
hm.put(102,"Silan");
hm.put(101,"Sushh");
hm.put(103,"Manu");
for(Map.Entry m:hm.entrySet())
{
System.out.println(m.getKey()+" "+m.getValue());

}
}
}

Output

100 Tapuuu
101 Sushh
102 Silan
103 Manu

HashMap vs. TreeMap:

HashMap is can contain one null key.	TreeMap can not contain any null key.
HashMap maintains no order.	TreeMap maintains ascending order.

About the Author

Silan Software

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We provide Academic Training || Industrial Training || Corporate Training || Internship || Java || Python || AI using Python || Data Science etc

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