Example
Merge items from one list into another.
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
ArrayList<String> cars = new ArrayList<String>();
cars.add("Volvo");
cars.add("BMW");
cars.add("Ford");
cars.add("Mazda");
ArrayList<String> brands = new ArrayList<String>();
brands.add("Microsoft");
brands.add("W3Schools");
brands.add("Apple");
brands.addAll(cars);
System.out.println(brands);
}
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Definition and Usage
The addAll() method appends all items from a collection to the list.
When an index is specified, the new items will be inserted at that position, shifting all subsequent elements in the list forward.
If no index is specified, the new items will be added to the end of the list.
Syntax
Choose one of the following:
public boolean addAll(Collection<T> items)
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public boolean addAll(int index, Collection<T> items)
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T denotes the data type of items in the list.
Parameter Values
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Parameter
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Description
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index
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Optional: The position in the list where the item should be added.
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items
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Required: The item that will be added to the list.
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Technical Details
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Returns:
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It returns true if the list has been altered, and false otherwise.
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Throws
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IndexOutOfBoundsException occurs if the index is negative or exceeds the list’s size.
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More Examples
Example
Insert items at a specific position within the list.
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
ArrayList<String> cars = new ArrayList<String>();
cars.add("Volvo");
cars.add("BMW");
cars.add("Ford");
cars.add("Mazda");
ArrayList<String> brands = new ArrayList<String>();
brands.add("Microsoft");
brands.add("W3Schools");
brands.add("Apple");
brands.addAll(1,cars);
System.out.println(brands);
}
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