The isEmpty(E e) method of CopyOnWriteArrayList checks if the list is empty or not. It returns true if the list is empty, else it returns false.
Syntax:
public boolean isEmpty()
Parameters: The function does not accepts any parameter.
Return Value: The function returns true if the list is empty, otherwise it returns false.
Below programs illustrate the above function:
Program 1:
// Java Program to illustrate the // isEmpty() 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);          // check using function        if (ArrLis.isEmpty())            System.out.println("List is empty");        else            System.out.println("List is not empty");          ArrLis.clear();          // check using function        if (ArrLis.isEmpty())            System.out.println("List is empty");        else            System.out.println("List is not empty");    }} |
Output:
CopyOnWriteArrayList: [32, 67, 98, 100] List is not empty List is empty
Program 2:
// Java Program to illustrate the // isEmpty() 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);          // check using function        if (ArrLis.isEmpty())            System.out.println("List is empty");        else            System.out.println("List is not empty");          ArrLis.clear();          // check using function        if (ArrLis.isEmpty())            System.out.println("List is empty");        else            System.out.println("List is not empty");    }} |
Output:
CopyOnWriteArrayList: [gopal, gfg, jgec, sudo] List is not empty List is empty
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#isEmpty–
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