Creating a Java TreeSet first requires importing the java.util.TreeSet package therefore, you should import it first. Once this package has been imported, use the Syntax below to create your TreeSet: TreeSet<Integer> TreeSet = new TreeSet<>(); The TreeSet is sorted in ascending order by default, but this can be customized using the Comparator interface. add(): the specified element is inserted into the set addAll(): Adds all elements of a collection to a set removeAll(): removes all elements from the set remove(): removes specified element first(): gets the first element of the set last(): gets the last element of the set In this example, we create a TreeSets object and add elements with the add() and addAll() methods. import java.util.TreeSet; public class TreeSetExample { public static void main(String[] args) { TreeSet<Integer> TS = new TreeSet<>(); //add elements using the add() method TS.add(7); TS.add(8); TS.add(9); System.out.println("First TreeSet: " + TS); TreeSet<Integer> numbers = new TreeSet<>(); numbers.add(6); // add element using the addAll() method numbers.addAll(TS); System.out.println("Second TreeSet: " + numbers); } } Output: First TreeSet: [7, 8, 9] Second TreeSet: [6, 7, 8, 9]
The Common TreeSet Methods
Example of TreeSets
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