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()