replaceAll()

Example

Increment every number in a list by 1.

import java.util.ArrayList;

public class Main { 
  public static void main(String[] args) { 
    ArrayList<Integer> list = 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 substitutes each item in a list with the outcome of a specified operation on that item. This operation can be defined using a lambda expression that conforms to Java’s UnaryOperator interface.

For further understanding of lambda expressions, refer to our Java Lambda Expression tutorial.

Syntax

public void replaceAll(UnaryOperator operator)

Parameter Values