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List isEmpty() method in Java with Examples

Last Updated : 03 Dec, 2024

The isEmpty() method of the 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.

Example:

// Java Progrm to Implement
// List isEmpty() Method
import java.util.*;

class Main 
{
    public static void main (String[] args) 
    {
      	// New empty list created
        List<Integer> l=new ArrayList<>();
      	
      	// Implementing isEmpty() Method
      	if(l.isEmpty())
      		System.out.println("List is Empty");
      	else
          	System.out.println("List is not Empty");
    }
}

boolean isEmpty()

• Parameter : It does not accept any parameter.
• Return Type : 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 errors or exceptions.

Below is the implementation of isEmpty() Method:

// Java Program Implementing 
// List isEmpty() Method
import java.util.List;
import java.util.ArrayList;

public class Main 
{
    public static void main(String[] args)
    {
      
      	// Creating Empty ArrayList
        List<Integer> arr = new ArrayList<Integer>();
      
      	// Demonstrating isEmpty() Method
      	System.out.print(arr + " : ");
		System.out.println(arr.isEmpty());
        
        arr.add(1);
      	arr.add(2);
      	arr.add(3);
      
      	// Demonstrating isEmpty() Method
		System.out.print(arr + " : ");
      	System.out.println(arr.isEmpty());
    }
}

[] : true
[1, 2, 3] : false

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/List.html#isEmpty()

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