Java List.retainAll(Collection <?> c)
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.
/*from w ww .j a v a 2s .com*/
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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