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:
Java
Java
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:
Program 2: Below is the code to show implementation of list.addAll() using Linkedlist.
[10, 15, 20] [100, 200, 300] [10, 15, 20, 100, 200, 300]
// 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:
Reference:
Oracle Docs
[10, 15, 20] [100, 200, 300] [10, 15, 20, 100, 200, 300]
