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About Ilias Tsagklis

Ilias Tsagklis
Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Remove all elements from LinkedHashSet example

With this example we are going to demonstrate how to remove all elements from a LinkedHashSet. The LinkedHashSet provides methods for such operations. In short, to remove all elements from a LinkedHashSet you should:

  • Create a new LinkedHashSet.
  • Populate the set with elements, using the add(E e) API method of LinkedHashSet.
  • Check whether the set contains any elements or not, with isEmpty() API method of LinkedHashSet. It will return false, since the set contains the elements inserted above.
  • Remove all elements from the set, with clear() API method of LinkedHashSet.
  • Check again if the set contains elements, with isEmpty() API method, that will return true this time.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

import java.util.LinkedHashSet;
 
public class RemoveAllElementsLinkedHashSet {
 
  public static void main(String[] args) {
 
    // Create a LinkedHashSet and populate it with elements
    LinkedHashSet linkedHashSet = new LinkedHashSet();
    linkedHashSet.add("element_1");
    linkedHashSet.add("element_2");
    linkedHashSet.add("element_3");

    // boolean isEmpty() method checks whether LinkedHashSet contains any elements or not   
    System.out.println("LinkedHashSet empty : " + linkedHashSet.isEmpty());
 
    // Remove all element from the LinkedHashSet using clear() or removeAll() methods
    linkedHashSet.clear();
    System.out.println("LinkedHashSet empty : " + linkedHashSet.isEmpty());

  }
}

Output:

LinkedHashSet empty : false
LinkedHashSet empty : true

 
This was an example of how to remove all elements from a LinkedHashSet in Java.

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