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Showing content from https://www.geeksforgeeks.org/java/copyonwritearraylist-clear-method-in-java/ below:

CopyOnWriteArrayList clear() method in Java

Last Updated : 11 Jul, 2025

The

clear()

method of

CopyOnWriteArrayList

erases all the elements in the list. The size of the list becomes zero after the function is called.

Syntax:

public void clear()

Parameters:

The function does not accept any parameters.

Return Value:

The function does not returns anything. Below programs illustrate the above function:

Program 1: Java


 // Java Program to illustrate the CopyOnWriteArrayList
// clear() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<Integer> ArrLis
            = new CopyOnWriteArrayList<Integer>();

        // Add elements
        ArrLis.add(32);
        ArrLis.add(67);
        ArrLis.add(98);
        ArrLis.add(100);

        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                            + ArrLis);

        ArrLis.clear();

        System.out.println("CopyOnWriteArrayList: " 
                                         + ArrLis);
    }
}

Output:

CopyOnWriteArrayList: [32, 67, 98, 100]
CopyOnWriteArrayList: []

Program 2: Java


 // Java Program to illustrate the CopyOnWriteArrayList
// clear() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<String> ArrLis
            = new CopyOnWriteArrayList<String>();

        // Add elements
        ArrLis.add("gopal");
        ArrLis.add("gfg");
        ArrLis.add("jgec");
        ArrLis.add("sudo");

        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                          + ArrLis);

        ArrLis.clear();

        System.out.println("CopyOnWriteArrayList: " 
                                         + ArrLis);
    }
}

Output:

CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]
CopyOnWriteArrayList: []

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#clear--

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