Remove All Elements from Java TreeSet Example

Java TreeSet Examples

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• Create TreeSet in Java Example
• How to Create a TreeSet and Add New Elements to It
• Java TreeSet add(), first() and last() Method Example
• Remove First and Last Element from TreeSet in Java
• Remove Element from TreeSet in Java Example
• Remove All Elements from Java TreeSet Example
• Check If an Element Exists in Java TreeSet Example
• Iterating over a TreeSet using Java 8 forEach() Method
• Iterate over a TreeSet using Iterator in Java Example
• Iterate over TreeSet in Java Example

<__ This Java Example shows how to remove all elements contained in Java TreeSet or clear TreeSet object using clear() method.

Remove All Elements from Java TreeSet Example

package com.javaguides.collections.treesetexamples;

import java.util.TreeSet;

public class RemoveTreeSetElementsExample {
    public static void main(String[] args) {
        TreeSet < Integer > numbers = new TreeSet < > ();

        numbers.add(10);
        numbers.add(15);
        numbers.add(20);
        numbers.add(25);
        numbers.add(30);
        numbers.add(42);
        numbers.add(49);
        numbers.add(50);

        System.out.println("numbers TreeSet : " + numbers);

        // Remove an element from the TreeSet
        numbers.clear();
        System.out.println("After clear() method -> " + numbers);
    }
}

Output

numbers TreeSet : [10, 15, 20, 25, 30, 42, 49, 50]
After clear() method -> []