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:

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// 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);
    }
}

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Output:


CopyOnWriteArraySet: [10, 20, 30, 40, 50, 60, 70, 80, 90]
Updated CopyOnWriteArraySet: [10, 20, 40, 50, 70, 80]





Program 2: 











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// 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); 


        } 


    } 


} 



















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Output:


CopyOnWriteArraySet: [GeeksforGeeks, GFG, Geeks, Gfg]
java.lang.NullPointerException






          
          
          
          

            

    

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