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List addAll() Method in Java with Examples
  • Last Updated : 02 Jan, 2019
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This method appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection’s iterator.

Syntax:

boolean addAll(Collection c)

Parameters: This function has a single parameter, i.e, Collection c, whose elements are to be appended to the list.

Returns: It returns true if the elements of specified list is appended and list changes.

Below programs show the implementation of this method.



Program 1:




// Java code to show the implementation of
// addAll method in list interface
import java.util.*;
public class GfG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Initializing a list of type arraylist
        List<Integer> l = new ArrayList<>();
        l.add(10);
        l.add(15);
        l.add(20);
        System.out.println(l);
  
        // Initializing a collection to be appended to list
        ArrayList<Integer> arr = new ArrayList<Integer>();
        arr.add(100);
        arr.add(200);
        arr.add(300);
        System.out.println(arr);
  
        l.addAll(arr);
  
        System.out.println(l);
    }
}
Output:
[10, 15, 20]
[100, 200, 300]
[10, 15, 20, 100, 200, 300]

Program 2: Below is the code to show implementation of list.addAll() using Linkedlist.




// Java code to show the implementation of
// addAll method in list interface
import java.util.*;
public class GfG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Initializing a list of type Linkedlist
        List<Integer> l = new LinkedList<>();
        l.add(10);
        l.add(15);
        l.add(20);
        System.out.println(l);
  
        // Initializing a collection to be appended to list
        ArrayList<Integer> arr = new ArrayList<Integer>();
        arr.add(100);
        arr.add(200);
        arr.add(300);
        System.out.println(arr);
  
        l.addAll(arr);
  
        System.out.println(l);
    }
}
Output:
[10, 15, 20]
[100, 200, 300]
[10, 15, 20, 100, 200, 300]

Reference:
Oracle Docs

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