CopyOnWriteArraySet removeIf() method in Java with Examples

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("GeeksforGeeks"); 
        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: [GeeksforGeeks, GFG, Geeks, Gfg]
java.lang.NullPointerException

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