CopyOnWriteArrayList isEmpty() method in Java Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report 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 // Java Program to illustrate the // isEmpty() 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); // 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 // Java Program to illustrate the // isEmpty() 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); // 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-- Comment More infoAdvertise with us Next Article CopyOnWriteArraySet isEmpty() method in Java G gopaldave Follow Improve Article Tags : Misc Java Java-Collections Java - util package Java-Functions Java-CopyOnWriteArrayList +2 More Practice Tags : JavaJava-CollectionsMisc Similar Reads CopyOnWriteArraySet isEmpty() method in Java The isEmpty(E e) method of CopyOnWriteArraySet checks if the Set is empty or not. It returns true if the Set is empty, else it returns false. Syntax: public boolean isEmpty() Return Value: The function returns true if the Set is empty, otherwise it returns false. Below programs illustrate the above 1 min read CopyOnWriteArraySet isEmpty() method in Java The isEmpty(E e) method of CopyOnWriteArraySet checks if the Set is empty or not. It returns true if the Set is empty, else it returns false. Syntax: public boolean isEmpty() Return Value: The function returns true if the Set is empty, otherwise it returns false. Below programs illustrate the above 1 min read CopyOnWriteArraySet isEmpty() method in Java The isEmpty(E e) method of CopyOnWriteArraySet checks if the Set is empty or not. It returns true if the Set is empty, else it returns false. Syntax: public boolean isEmpty() Return Value: The function returns true if the Set is empty, otherwise it returns false. Below programs illustrate the above 1 min read CopyOnWriteArrayList iterator() method in Java The iterator() method of CopyOnWriteArrayList returns an iterator over the elements in this list in proper sequence. The iterator does NOT support the remove method. Syntax: public Iterator iterator() Parameters: The function does not accept any parameters. Return Value: The function returns an iter 2 min read CopyOnWriteArrayList iterator() method in Java The iterator() method of CopyOnWriteArrayList returns an iterator over the elements in this list in proper sequence. The iterator does NOT support the remove method. Syntax: public Iterator iterator() Parameters: The function does not accept any parameters. Return Value: The function returns an iter 2 min read CopyOnWriteArrayList iterator() method in Java The iterator() method of CopyOnWriteArrayList returns an iterator over the elements in this list in proper sequence. The iterator does NOT support the remove method. Syntax: public Iterator iterator() Parameters: The function does not accept any parameters. Return Value: The function returns an iter 2 min read Like