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Java LinkedList retainAll() Method

❮ LinkedList Methods


Example

Remove items from a list which do not belong to a specified collection:

import java.util.LinkedList;

public class Main {
  public static void main(String[] args) {
    LinkedList<String> cars = new LinkedList<String>();
    cars.add("Volvo");
    cars.add("BMW");
    cars.add("Ford");
    cars.add("Mazda");
    cars.add("Toyota");
    
    LinkedList<String> valid = new LinkedList<String>();
    valid.add("Volvo");
    valid.add("Ford");
    valid.add("Mazda");
    
    cars.retainAll(valid);
    
    System.out.println(cars);
  }
}

Try it Yourself »


Definition and Usage

The retainAll() method removes all items from a list which do not belong to a specified collection.


Syntax

public boolean retainAll(Collection items)

Parameter Values

Parameter Description
items Required. A collection containing the items to keep in the list while all others are removed.

Technical Details

Returns: true if the list changed and false otherwise.
Throws: NullPointerException - If the collection is null.

Related Pages

Java Arrays Tutorial

Java LinkedList Tutorial


❮ LinkedList Methods
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