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Java LinkedList add() Method

❮ LinkedList Methods


Example

Add items from one list into another:

import java.util.LinkedList;

public class Main {
  public static void main(String[] args) {
    LinkedList<String> cars = new LinkedList<String>();
    cars.add("Volvo");
    cars.add("BMW");
    cars.add("Ford");
    cars.add("Mazda");
    
    LinkedList<String> brands = new LinkedList<String>();
    brands.add("Microsoft");
    brands.add("W3Schools");
    brands.add("Apple");
    
    brands.addAll(cars);
    
    System.out.println(brands);
  }
}

Try it Yourself »


Definition and Usage

The addAll() method adds all of the items from a collection to the list.

If an index is provided then the new items will be placed at the specified index, pushing all of the following elements in the list ahead.

If an index is not provided then the new items will be placed at the end of the list.


Syntax

One of the following:

public boolean addAll(Collection<T> items)
public boolean addAll(int index, Collection<T> items)

T refers to the data type of items in the list.

Parameter Values

Parameter Description
index Optional. The position in the list at which to add the items.
items Required. A collection containing items to be added to the list.

Technical Details

Returns: true if the list changed and false otherwise.
Throws: IndexOutOfBoundsException - If the index is less than zero or greater than the size of the list.
NullPointerException - If the collection is null.

More Examples

Example

Add items at a specified position in the list:

import java.util.LinkedList;

public class Main {
  public static void main(String[] args) {
    LinkedList<String> cars = new LinkedList<String>();
    cars.add("Volvo");
    cars.add("BMW");
    cars.add("Ford");
    cars.add("Mazda");
    
    LinkedList<String> brands = new LinkedList<String>();
    brands.add("Microsoft");
    brands.add("W3Schools");
    brands.add("Apple");
    
    brands.addAll(1, cars);
    
    System.out.println(brands);
  }
}

Try it Yourself »


Related Pages

Java Arrays Tutorial

Java LinkedList Tutorial


❮ LinkedList Methods
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