Java Design Pattern
Introduction to Java 10
Introduction to Java 11
Introduction to Java 12

Java TreeMap

  • • A TreeMap contains values based on the key.
  • • It implements the NavigableMap interface.
  • • It contains only unique elements.
  • • It cannot have null key but can have multiple null values.
  • • Insertion order is preserved.
Let's see a program:
import java.util.*;
	public static void main(String args[])
		TreeMaphm=new TreeMap();  
		for(Map.Entry m:hm.entrySet())
			System.out.println(m.getKey()+" "+m.getValue()); 									   


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.

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