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 Program to illustrate the CopyOnWriteArrayList// clear() method in Javaimport 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 Program to illustrate the CopyOnWriteArrayList// clear() method in Javaimport 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–
