List addAll() Method in Java with Examples
Last Updated :
02 Jan, 2019
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:
import java.util.*;
public class GfG {
public static void main(String[] args)
{
List<Integer> l = new ArrayList<>();
l.add( 10 );
l.add( 15 );
l.add( 20 );
System.out.println(l);
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.
import java.util.*;
public class GfG {
public static void main(String[] args)
{
List<Integer> l = new LinkedList<>();
l.add( 10 );
l.add( 15 );
l.add( 20 );
System.out.println(l);
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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