The isEmpty() method of ArrayList in java is used to check if a list is empty or not. It returns true if the list contains no elements otherwise it returns false if the list contains any element.
Syntax:
list_name.isEmpty()
Parameter: It does not accepts any parameter.
Returns: It returns True if the list list_name has no elements else it returns false. The return type is of datatype boolean.
Error and Exceptions: This method has no error or exceptions.
Program to demonstrate working of isEmpty() in Java:
// Java code to demonstrate the working of// isEmpty() method in ArrayList // for ArrayList functionsimport java.util.ArrayList; public class GFG { public static void main(String[] args) { // creating an Empty Integer ArrayList ArrayList<Integer> arr = new ArrayList<Integer>(10); // check if the list is empty or not using function boolean ans = arr.isEmpty(); if (ans == true) System.out.println("The ArrayList is empty"); else System.out.println("The ArrayList is not empty"); // addition of a element to the ArrayList arr.add(1); // check if the list is empty or not ans = arr.isEmpty(); if (ans == true) System.out.println("The ArrayList is empty"); else System.out.println("The ArrayList is not empty"); }} |
Output:
The ArrayList is empty The ArrayList is not empty
