Learn Java Programming - ArrayList removeIf Method Tutorial

Published: 07 November 2015
on channel: Daniel Ross

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The removeIf method removes all matching elements in the current ArrayList instance that evaluate to true for the Predicate expression filter (say what??? - I'll explain). In order to use this method, you will need to have a basic understanding of lambda expressions. If you are not familiar with lambda expressions, the following tutorials will teach you what you need to know in order to use this method:

Lambda Expressions Introduction
Lambda Block Body
Lambda and Generic Funtional Interface

The Predicate interface is a functional interface that has a single abstract method named test that returns a primitive boolean result.
public interface Predicate chevron T chevron {
boolean test(T t);
}
So basically we can pass a Predicate based lambda expression as the argument for this method to do its thing. I'll demonstrate exactly how the Predicate interface works in the source code.

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