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Java HashSet clear() Method with Example

HashSet Class clear() method: Here, we are going to learn about the clear() method of HashSet Class with its syntax and example.
Submitted by Preeti Jain, on March 05, 2020

HashSet Class clear() method

  • clear() method is available in java.util package.
  • clear() method is used to clear all of the element exists from this HashSet.
  • clear() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • clear() method does not throw an exception at the time of clearing elements.

Syntax:

    public void clear();

Parameter(s):

  • It does not accept any parameter.

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void clear() method of HashSet 

import java.util.*;

public class ClearOfHashSet {
    public static void main(String[] args) {
        // Instantiates a HashSet object
        HashSet < String > hs = new HashSet < String > ();

        // By using add() method is to add
        // the given object of this HashSet 
        hs.add("C");
        hs.add("C++");
        hs.add("JAVA");
        hs.add("PHP");
        hs.add("SFDC");

        // Display HashSet
        System.out.println("HashSet: " + hs);

        // By using clear() method is to
        // remove all of the elements exists
        // in this HashSet
        hs.clear();

        //Display Modified HashSet
        System.out.println("hs.clear(): " + hs);
    }
}

Output

HashSet: [JAVA, C++, C, SFDC, PHP]
hs.clear(): []






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