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List isEmpty() method in Java with Examples

  • Last Updated : 23 Aug, 2020

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:

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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()




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