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–
