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ArrayList isEmpty() in Java with example

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  • Difficulty Level : Easy
  • Last Updated : 27 Aug, 2020

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 functions
import 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
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