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How to join/combine two ArrayLists in java

Last Updated: September 11, 2022 by Chaitanya Singh | Filed Under: java

In this tutorial we will see how to join (or Combine) two ArrayLists in Java. We will be using addAll() method to add both the ArrayLists in one final ArrayList.

Example:

In this example we are merging two ArrayLists in one single ArrayList and then displaying the elements of final List.

package beginnersbook.com;
import java.util.ArrayList;
public class Details
{
    public static void main(String [] args)
    {
        //First ArrayList
        ArrayList<String> arraylist1=new ArrayList<String>();
        arraylist1.add("AL1: E1");
        arraylist1.add("AL1: E2");
        arraylist1.add("AL1: E3");

        //Second ArrayList
        ArrayList<String> arraylist2=new ArrayList<String>();
        arraylist2.add("AL2: E1");
        arraylist2.add("AL2: E2");
        arraylist2.add("AL2: E3");

        //New ArrayList
        ArrayList<String> al= new ArrayList<String>();
        al.addAll(arraylist1);
        al.addAll(arraylist2);

        //Displaying elements of the joined ArrayList
        for(String temp: al){
            System.out.println(temp);
        }
    }
}

Output:

AL1: E1
AL1: E2
AL1: E3
AL2: E1
AL2: E2
AL2: E3

Top Related Articles:

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  4. Java ArrayList addAll(int index, Collection c) Method example
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Tags: Collections, Java-ArrayList

About the Author

I have 15 years of experience in the IT industry, working with renowned multinational corporations. Additionally, I have dedicated over a decade to teaching, allowing me to refine my skills in delivering information in a simple and easily understandable manner.

– Chaitanya

Comments

  1. Rajasekhar says

    February 25, 2016 at 4:59 AM

    Hai Thanks for your awesome tutorial i have one small doubt regarding this joining to Lists can we join String type and Integer type together if yes please give me one small example
    once again thanks for your work u made my learning easy

    Reply

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