Java: Test an linked list is empty or not

Last update on May 22 2025 13:15:54 (UTC/GMT +8 hours)

25. Check if LinkedList is Empty

Write a Java program to check if a linked list is empty or not.

Sample Solution:-

Java Code:

import java.util.LinkedList;
import java.util.Collections;
  public class Exercise25 {
  public static void main(String[] args) {
          LinkedList<String> c1= new LinkedList<String>();
          c1.add("Red");
          c1.add("Green");
          c1.add("Black");
          c1.add("White");
          c1.add("Pink");
          System.out.println("Original linked list: " + c1);
          System.out.println("Check the above linked list is empty or not! "+c1.isEmpty());
          c1.removeAll(c1);
          System.out.println("Linked list after remove all elements "+c1);   
          System.out.println("Check the above linked list is empty or not! "+c1.isEmpty());
   }
}

Sample Output:

Original linked list: [Red, Green, Black, White, Pink]                 
Check the above linked list is empty or not! false                     
Linked list after remove all elements []                               
Check the above linked list is empty or not! true 

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to determine if a linked list is empty using the isEmpty() method and print an appropriate message.
• Write a Java program to use a lambda expression that returns true if a linked list contains no elements.
• Write a Java program to compare two linked lists and check if one is empty while the other is not.
• Write a Java program to implement a recursive method to check if a linked list is empty without using built-in methods.

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