public void replaceAll(UnaryOperator operator)

// Java Program to illustrate CopyOnArrayList
// replaceAll() method
  
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
import java.util.function.UnaryOperator;
  
public class GFG {
    public static void main(String[] args)
    {
        CopyOnWriteArrayList<String> ArrLis1
            = new CopyOnWriteArrayList<String>();
  
        // Add elements
        ArrLis1.add("White");
  
        ArrLis1.add("Red");
  
        ArrLis1.add("Blue");
  
        ArrLis1.add("Green");
  
        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: "
                           + ArrLis1);
  
        // check using function
        ArrLis1.replaceAll(new MyOperator());
  
        // print CopyOnWriteArrayList
        System.out.println("After replacement CopyonWriteArrayList: "
                           + ArrLis1);
    }
}
  
class MyOperator implements UnaryOperator<String> {
    public String apply(String t)
    {
        return t.replaceAll("Red", "White");
    }
}

CopyOnWriteArrayList: [White, Red, Blue, Green]
After replacement CopyonWriteArrayList: [White, White, Blue, Green]