Java LinkedList size() Method

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Description

The Java LinkedList size() method returns the number of elements in this list i.e the size of the list. It is updated everytime a change is made to the LinkedList.

Declaration

Following is the declaration for java.util.LinkedList.size() method

public int size()

Parameters

NA

Return Value

This method returns the number of elements in this list.

Exception

NA

Example

Getting Size of the LinkedList of Integers Example

The following example shows the usage of Java LinkedList size() method. We're adding couple of Integers to the LinkedList object using add() method calls per element. Size of the linkedlist is printed using size() method. And using remove(index) method, we're removing one element and size of the linkedlist is again printed.

package com.tutorialspoint;

import java.util.LinkedList;

public class LinkedListDemo {
   public static void main(String[] args) {
      
      // create an empty linked list 
      LinkedList<Integer> linkedList = new LinkedList<>();

      // use add() method to add elements in the linkedList
      linkedList.add(20);
      linkedList.add(30);
      linkedList.add(20);
      linkedList.add(30);
      linkedList.add(15);
      linkedList.add(22);
      linkedList.add(11);

      // let us print the size of the linkedList again
      System.out.println("LinkedList Size = " + linkedList.size());
	  
      // remove an element at index 2
      linkedList.remove(2);

      // let us print the size of the linkedList again
      System.out.println("LinkedList Size = " + linkedList.size());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

LinkedList Size = 7
LinkedList Size = 6

Getting Size of the LinkedList of Strings Example

The following example shows the usage of Java LinkedList size() method. We're adding couple of Strings to the LinkedList object using add() method calls per element. Size of the linkedlist is printed using size() method. And using remove(index) method, we're removing one element and size of the linkedlist is again printed.

package com.tutorialspoint;

import java.util.LinkedList;

public class LinkedListDemo {
   public static void main(String[] args) {
      
      // create an empty linked list
      LinkedList<String> linkedList = new LinkedList<>();

      // use add() method to add elements in the linkedList
      linkedList.add("Welcome");
      linkedList.add("To");
      linkedList.add("Tutorialspoint");

      // let us print the size of the linkedList again
      System.out.println("LinkedList Size = " + linkedList.size());
	  
      // remove an element at index 2
      linkedList.remove(2);

      // let us print the size of the linkedList again
      System.out.println("LinkedList Size = " + linkedList.size());    
   }
}

Output

Let us compile and run the above program, this will produce the following result −

LinkedList Size = 3
LinkedList Size = 2

Getting Size of the LinkedList of Objects Example

The following example shows the usage of Java LinkedList size() method. We're adding couple of Student objects to the LinkedList object using add() method calls per element. Size of the linkedlist is printed using size() method. And using remove(index) method, we're removing one element and size of the linkedlist is again printed.

package com.tutorialspoint;

import java.util.LinkedList;

public class LinkedListDemo {
   public static void main(String[] args) {

      // create an empty linkedList
      LinkedList<Student> linkedList = new LinkedList<>();

      // use add() method to add elements in the linkedList
      linkedList.add(new Student(1, "Julie"));
      linkedList.add(new Student(2, "Robert"));
      linkedList.add(new Student(3, "Adam"));
	  
      // let us print the size of the linkedList again
      System.out.println("LinkedList Size = " + linkedList.size());
	  
      // remove an element at index 2
      linkedList.remove(2);

      // let us print the size of the linkedList again
      System.out.println("LinkedList Size = " + linkedList.size());      
   }
}

class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
}

Output

Let us compile and run the above program, this will produce the following result −

LinkedList Size = 3
LinkedList Size = 2