Java TreeSet

In this tutorial, we will learn about the Java TreeSet class and its various operations and methods with the help of examples.

The TreeSet class of the Java collections framework provides the functionality of a tree data structure.

TreeSet class which is implemented in the collections framework an implementation of the SortedSet Interface and SortedSet extends Set Interface. It behaves like simple set with the exception that it stores elements in sorted format. TreeSet uses tree data structure for storage. Objects are stored in sorted, ascending order. But we can iterate in descending order using method

Example:

// Java program to demonstrate TreeSet 
import java.util.*; 
  
class TreeSetExample { 
  
    public static void main(String[] args) 
    { 
        TreeSet<String> ts1 = new TreeSet<String>(); 
  
        // Elements are added using add() method 
        ts1.add("A"); 
        ts1.add("B"); 
        ts1.add("C"); 
  
        // Duplicates will not get insert 
        ts1.add("C"); 
  
        // Elements get stored in default natural 
        // Sorting Order(Ascending) 
        System.out.println(ts1); 
    } 
} 
output:
[A, B, C]

Methods in Java Tree Set