Java Collection Tutorial - Java List.retainAll(Collection <?> c)

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Syntax

List.retainAll(Collection <?> c) has the following syntax.

boolean retainAll(Collection <?> c)

Example

In the following code shows how to use List.retainAll(Collection <?> c) method.

//w  w w  . j a v a  2 s. c om

import java.util.ArrayList;
import java.util.List;

public class Main {
  public static void main(String[] argv) throws Exception {
    List<String> list1 = new ArrayList();
    List<String> list2 = new ArrayList();

    list1.addAll(list2);

    list1.removeAll(list2);

    list1.retainAll(list2);

    list1.clear();

    int newSize = 2;
    list1.subList(newSize, list1.size()).clear();
  }
}

The code above generates the following result.

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