The removeIf() method of CopyonWriteArraySet method removes the element from this CopyOnWriteArraySet that satisfies the specified condition.
Syntax:
public boolean removeIf (Predicate<E> filter)
Parameters: This method accepts a mandatory parameter filter which is the predicate value based on which elements are removed from this set.
Return Value: This method returns a boolean value such as true, if the CopyOnWriteArraySet is changed. Else this method returns false.
Exceptions: This method throws NullPointerException if the specified Predicate filter is null.
Below program illustrates the removeIf() function of CopyOnWriteArrayList class :
Program 1:
// Java Program to illustrate the CopyOnWriteArraySet// removeIf() method in Java import java.util.concurrent.CopyOnWriteArraySet;import java.util.*; public class GFG { public static void main(String[] args) { // create object of CopyOnWriteArraySet CopyOnWriteArraySet<Integer> ArrSet = new CopyOnWriteArraySet<Integer>(); // Add elements ArrSet.add(10); ArrSet.add(20); ArrSet.add(30); ArrSet.add(40); ArrSet.add(50); ArrSet.add(60); ArrSet.add(70); ArrSet.add(80); ArrSet.add(90); // print CopyOnWriteArraySet System.out.println("CopyOnWriteArraySet: " + ArrSet); // if a number in the set is // divisible by 3, then remove it ArrSet.removeIf(number -> number % 3 == 0); // print updated CopyOnWriteArraySet System.out.println("Updated CopyOnWriteArraySet: " + ArrSet); }} |
Output:
CopyOnWriteArraySet: [10, 20, 30, 40, 50, 60, 70, 80, 90] Updated CopyOnWriteArraySet: [10, 20, 40, 50, 70, 80]
Program 2:
// Java Program to illustrate the CopyOnWriteArraySet// removeIf() method in Java import java.util.concurrent.CopyOnWriteArraySet;import java.util.*; public class GFG { public static void main(String[] args) { // create object of CopyOnWriteArraySet CopyOnWriteArraySet<String> ArrSet = new CopyOnWriteArraySet<String>(); // Add elements ArrSet.add("Lazyroar"); ArrSet.add("GFG"); ArrSet.add("Geeks"); ArrSet.add("Gfg"); // print CopyOnWriteArraySet System.out.println("CopyOnWriteArraySet: " + ArrSet); try { // if a number in the set is // divisible by 3, then remove it // This will throw NullPointerException ArrSet.removeIf(null); } catch (Exception e) { System.out.println(e); } }} |
Output:
CopyOnWriteArraySet: [Lazyroar, GFG, Geeks, Gfg] java.lang.NullPointerException