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Text lesson

replaceAll()

Example

Increment every number in the list by 1.

import java.util.LinkedList;

public class Main {

  public static void main(String[] args) {

    LinkedList<Integer> numbers = new LinkedList<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 substitutes each item in a list with the outcome of an operation applied to that item. This operation can be expressed through a lambda expression compatible with Java’s UnaryOperator interface.

Syntax

public void replaceAll(UnaryOperator operator)

Parameter Values

Parameter	Description
operator	Mandatory: A UnaryOperator or lambda expression that acts on each item in the list.