The removeIf() method of CopyOnWriteArrayList removes the element from this CopyOnWriteArrayList 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 List.
Return Value: This method returns a boolean value such as true, if the CopyOnWriteArrayList 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 :
// Java Program to illustrate the CopyOnWriteArrayList // removeIf() method in Java import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArrayList
CopyOnWriteArrayList<Integer> ArrLis
= new CopyOnWriteArrayList<Integer>();
// Add elements
ArrLis.add( 2 );
ArrLis.add( 3 );
ArrLis.add( 4 );
ArrLis.add( 7 );
ArrLis.add( 6 );
ArrLis.add( 9 );
// print CopyOnWriteArrayList
System.out.println( "CopyOnWriteArrayList: "
+ ArrLis);
// if a number in the List is
// divisible by 3, then remove it
ArrLis.removeIf(number -> number % 3 == 0 );
// print updated CopyOnWriteArrayList
System.out.println( "Updated CopyOnWriteArrayList: "
+ ArrLis);
}
} |
CopyOnWriteArrayList: [2, 3, 4, 7, 6, 9] Updated CopyOnWriteArrayList: [2, 4, 7]
// Java Program to illustrate the CopyOnWriteArrayList // removeIf() method in Java import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArrayList
CopyOnWriteArrayList<String> ArrLis
= new CopyOnWriteArrayList<String>();
// Add elements
ArrLis.add( "GeeksforGeeks" );
ArrLis.add( "GFG" );
ArrLis.add( "Geeks" );
ArrLis.add( "Gfg" );
// print CopyOnWriteArrayList
System.out.println( "CopyOnWriteArrayList: "
+ ArrLis);
try {
// This will throw NullPointerException
ArrLis.removeIf( null );
}
catch (Exception e) {
System.out.println(e);
}
}
} |
CopyOnWriteArrayList: [GeeksforGeeks, GFG, Geeks, Gfg] java.lang.NullPointerException