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);
}
} |
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);
}
}
} |
CopyOnWriteArraySet: [GeeksforGeeks, GFG, Geeks, Gfg] java.lang.NullPointerException