Question

How to add all the elements of a list to another list in Java

Answer 1

import java.util.ArrayList;
import java.util.List;

public class MergeLists {
    public static void main(String[] args) {
        List<Integer> list1 = new ArrayList<>();
        list1.add(1);
        list1.add(2);
        list1.add(3);

        List<Integer> list2 = new ArrayList<>();
        list2.add(4);
        list2.add(5);

        list1.addAll(list2);  // Adds all elements of list2 to list1

        System.out.println(list1); 
    }
}



/*
run:

[1, 2, 3, 4, 5]

*/

 

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