CopyOnWriteArrayList isEmpty() method in Java
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–
