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TreeSet clear() Method in Java
  • Last Updated : 26 Nov, 2018

The Java.util.TreeSet.clear() method is used to remove all the elements from a TreeSet. Using the clear() method only clears all the element from the set and not deletes the set. In other words, we can say that the clear() method is used to only empty an existing TreeSet.

Syntax:

Tree_Set.clear()

Parameters: The method does not take any parameter

Return Value: The function does not return anything.

Below program illustrates the use of Java.util.TreeSet.clear() method:

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// Java code to illustrate addAll()
import java.io.*;
import java.util.TreeSet;
  
public class TreeSetDemo {
    public static void main(String args[])
    {
        // Creating an empty TreeSet
        TreeSet<String> tree = new TreeSet<String>();
  
        // Use add() method to add elements into the Set
        tree.add("Welcome");
        tree.add("To");
        tree.add("Geeks");
        tree.add("4");
        tree.add("Geeks");
        tree.add("TreeSet");
  
        // Displaying the TreeSet
        System.out.println("TreeSet: " + tree);
  
        // Clearing the TreeSet using clear() method
        tree.clear();
  
        // Displaying the final tree
        System.out.println("After clearing TreeSet: " + tree);
    }
}

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Output:

TreeSet: [4, Geeks, To, TreeSet, Welcome]
After clearing TreeSet: []

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