Java Collection Tutorial - Java ArrayList.addAll(Collection <? extends E > c)

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Syntax

ArrayList.addAll(Collection <? extends E > c) has the following syntax.

public boolean addAll(Collection <? extends E> c)

Example

In the following code shows how to use ArrayList.addAll(Collection <? extends E > c) method.

//  w w w. j a  va2s .  c  o m
import java.util.ArrayList;

public class Main {
  public static void main(String args[]) {
    ArrayList<Integer>  arrlist = new ArrayList<Integer> (5);
  
    arrlist.add(1);
    arrlist.add(2);
    arrlist.add(4);

    System.out.println(arrlist);

    ArrayList<Integer>  arrlist2 = new ArrayList<Integer> (5);
    arrlist2.add(2);
    arrlist2.add(3);
    arrlist2.add(3);
    arrlist2.add(3);

    System.out.println(arrlist2);
    
    // inserting all elements
    arrlist.addAll(arrlist2);
  
    System.out.println(arrlist);
    

  }
}

The code above generates the following result.

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