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About Byron Kiourtzoglou

Byron Kiourtzoglou
Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Remove all elements from ArrayList example

With this example we are going to demonstrate how to remove all elements from an ArrayList, that means clearing the arrayList. In short, to clear an ArrayList you should:

  • Create a new ArrayList.
  • Populate the arrayList with elements, using add(E e) API method of ArrayList.
  • Invoke clear() API method of ArrayList. The method removes all of the elements from this list.
  • We can get the size of the arrayList before and after clearing it. The size will be equal to zero after clearing it.

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

package com.javacodegeeks.snippets.core;

import java.util.ArrayList;
 
public class RemoveAllElementsArrayList {
 
  public static void main(String[] args) {

    // Create an ArrayList and populate it with elements
    ArrayList arrayList = new ArrayList();
    arrayList.add("element_1");
    arrayList.add("element_2");
    arrayList.add("element_3");
 
    System.out.println("ArrayList size before removing elements : " + arrayList.size());

    // ArrayList clear() operation removes all elements
    arrayList.clear();

    System.out.println("ArrayList size after removing elements : " + arrayList.size());
 
  }
}

Output:

ArrayList size before removing elements : 3
ArrayList size after removing elements : 0

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

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