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Java LinkedList add() Method

The Java LinkedList add(E e) method appends the specified element E to the end of the list. This method is used to add elements to the linkedlist after its creation.

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

public boolean add(E e)

e − The element to be appended to this list.

This method returns true.

NA

The Java LinkedList add(int index, E element) method inserts the specified element E at the specified position in this list.It shifts the element currently at that position (if any) and any subsequent elements to the right (will add one to their indices).

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

public void add(int index, E element)

• index − The index at which the specified element is to be inserted.

• element − The element to be inserted.

This method does not return any value.

IndexOutOfBoundsException − if the index is out of range.

The following example shows the usage of Java LinkedList add(E) method to add Integers. We're adding couple of Integers to the LinkedList object using add() method calls per element and then print each element to show the elements added.

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 all the elements available in linkedList
      for (Integer number : linkedList) {
         System.out.println("Number = " + number);
      }
   }
}

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

Number = 20
Number = 30
Number = 20
Number = 30
Number = 15
Number = 22
Number = 11

The following example shows the usage of Java LinkedList add(E) method to add Strings. We're adding couple of strings to the LinkedList object using add() method calls per element and then printing the LinkedList using its toString() method.

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");
      System.out.println("LinkedList = " + linkedList);      
   }
}

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

LinkedList = [Welcome, To, Tutorialspoint]

The following example shows the usage of Java LinkedList add(index, E) method to add Student objects at particular index. We're adding couple of Student objects to the LinkedList object using add() method calls per element and using add(index, E) in the end to add a student at particular location and then printing the LinkedList using its toString() method.

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(0, new Student(3, "Adam"));
      System.out.println("LinkedList = " + linkedList);      
   }
}

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 + " ]";
   }
}

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

LinkedList = [[ 3, Adam ], [ 1, Julie ], [ 2, Robert ]]

java_util_linkedlist.htm

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