List isEmpty() method in Java with Examples (original) (raw)

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 `

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

class Main { public static void main (String[] args) { // New empty list created List l=new ArrayList<>();

      // Implementing isEmpty() Method
      if(l.isEmpty())
          System.out.println("List is Empty");
      else
          System.out.println("List is not Empty");
}

}

`

**Syntax of the Method

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.

Program Demonstrating List isEmpty() in Java

Below is the implementation of isEmpty() Method:

Java `

// 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());
}

}

`

Output

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

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