java.util.TreeSet.clear() Method

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Description

The clear() method is used to remove all of the elements from this set.

Declaration

Following is the declaration for java.util.TreeSet.clear() method.

public void clear()

Parameters

  • NA

Return Value

NA

Exception

  • NA

Example

The following example shows the usage of java.util.TreeSet.clear() method.

package com.tutorialspoint;

import java.util.Iterator;
import java.util.TreeSet;

public class TreeSetDemo {
   public static void main(String[] args) {
     // creating a TreeSet 
     TreeSet <Integer>treeadd = new TreeSet<Integer>();
     
     // adding in the tree set
     treeadd.add(12);
     treeadd.add(13);
     treeadd.add(14);
     treeadd.add(15);
     
     // create an iterator
     Iterator iterator;
     iterator = treeadd.iterator();
     
     // displaying the Tree set data
     System.out.println("Tree set data: ");     
     while (iterator.hasNext()){
        System.out.println(iterator.next() + " ");
     }
     
     // clearing the set
     System.out.println("Clearing tree"); 
     treeadd.clear();
     System.out.println("Size of the tree: "+treeadd.size());      
   }     
}

Let us compile and run the above program, this will produce the following result.

Tree set data: 
12 
13 
14 
15 
Clearing tree
Size of the tree: 0



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