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How do I insert all elements from one list into another in Java?
Solution
We can add all elements of one list into another list easily using its addAll() method.
Syntax
boolean addAll(Collection<? extends E> c)
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.
Type Parameter
E − The runtime type of the collection passed.
Parameters
c − Collection containing elements to be added to this list.
Returns
True if this list changed as a result of the call
Throws
UnsupportedOperationException − If the addAll operation is not supported by this list.
ClassCastException − If the class of an element of the specified collection prevents it from being added to this list.
NullPointerException − If the specified collection contains one or more null elements and this list does not permit null elements, or if the specified collection is null.
IllegalArgumentException − If some property of an element of the specified collection prevents it from being added to this list.
Example
The following example shows how to add all elements from a list into another list using the addAll() method.
package com.tutorialspoint;
import java.util.ArrayList;
import java.util.List;
public class CollectionsDemo {
public static void main(String[] args) {
// Create a list object
List<Integer> list = new ArrayList<>();
// add elements to the list
list.add(1);
list.add(2);
list.add(3);
list.add(4);
list.add(5);
list.add(6);
// print the list
System.out.println(list);
List<Integer> list1 = new ArrayList<>();
list1.add(0);
list1.addAll(list);
System.out.println(list1);
}
}Output
This will produce the following result −
[1, 2, 3, 4, 5, 6] [0, 1, 2, 3, 4, 5, 6]
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