Java List isEmpty() Method with Examples

by Online Tutorials Library July 22, 2022

Java List isEmpty() Method

The isEmpty() method of List interface returns a Boolean value ‘true’ if this list contains no elements.

Syntax

Parameters

Specified By

isEmpty in interface Collection<E>

Return

The isEmpty () method returns the Boolean value ‘true’ if this list contains no elements, else it returns false.

Example 1

  import java.util.LinkedList;  import java.util.List;  public class JavaListIsEmptyExample1 {  public static void main(String[] args) {          List<Character> list = new LinkedList<Character>();  //this methods checks whether the invoked list is empty or not  Boolean bool = list.isEmpty();  if(bool){  System.out.println(“Enter elements in this list as it is empty.”);          }  else{  System.out.println(“Elements are already present in this list.nList : “+list);          }      }  }  

Test it Now

Output:

Enter elements as this list is empty.

Example 2

  import java.util.LinkedList;  import java.util.List;  public class JavaListIsEmptyExample2 {  public static void main(String[] args) {          List<Character> list = new LinkedList<Character>();  list.add(null);  //this methods checks whether the invoked list is empty or not  Boolean bool = list.isEmpty();  //even if there are null elements it will return false  if(bool){  System.out.println(“Enter elements in this list as it is empty.”);          }  else{  System.out.println(“Elements are already present in this list.nList : “+list);          }      }  }  

Test it Now

Output:

Elements are already present in this list.  List : [null]

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