❮ ArrayList Methods
Example
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
ArrayList<Integer> numbers = new ArrayList<Integer>();
numbers.add(5);
numbers.add(9);
numbers.add(8);
numbers.add(6);
numbers.add(1);
numbers.replaceAll( n -> n + 1 );
System.out.println(numbers);
}
}Definition and Usage
The replaceAll() method replaces every item in a list with the result of performing an operation on the item. The operation can be defined by a lambda expression that is compatible with Java's UnaryOperator interface.
To learn about lambda expressions, see our Java Lambda Expression tutorial .
Syntax
public void replaceAll(UnaryOperator
operator )Parameter Values
| Parameter | Description |
|---|---|
| operator | Required. A UnaryOperator or lambda expression which operates on each item from the list. |