The isEmpty() method of List interface 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:
boolean isEmpty()
Parameter: It does not accepts any parameter.
Returns: It returns True if the list 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 List interface import java.util.*; public class GFG { public static void main(String[] args) { // creating an Empty Integer List List<Integer> arr = new ArrayList<Integer>(10); // check if the list is empty or not // using isEmpty() function boolean ans = arr.isEmpty(); if (ans == true) System.out.println("The List is empty"); else System.out.println("The List is not empty"); // addition of a element to // the List arr.add(1); // check if the list is empty or not // after adding an element ans = arr.isEmpty(); if (ans == true) System.out.println("The List is empty"); else System.out.println("The List is not empty"); }} |
Output:
The List is empty The List is not empty
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/List.html#isEmpty()
