How to join/combine two ArrayLists in 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