Java ConcurrentLinkedQueue removeIf() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentLinkedQueue removeIf() Method

The removeIf() method of ConcurrentLinkedQueue class removes the elements of this queue that satisfies the given predicate filter.

Syntax:

Parameters:

The parameter filter is a predicate which returns true for the elements to be removed.

Specified By:

The removeIf() method of ConcurrentLinkedQueue class is specified by:

removeIf in interface Collection<E>.

Return Value:

The removeIf () method returns a Boolean value ‘true’ if the collection has removed any element, else it returns ‘false’.

Throws:

It throws NullPointerException if the specified filter is null.

Example 1

  import java.util.concurrent.ConcurrentLinkedQueue;  import java.util.function.Predicate;  public class ConcurrentLinkedQueueRemoveIfExample1 {      public static void main(String[] args) {          ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();          for (int i=1;i<21;i++){              queue.add(i);}          System.out.println(“Total no : “+ queue);          //removes all the elements which satisfies the predicate filter          Predicate<Integer> pr= a->(a>10);          queue.removeIf(pr );          System.out.println(” Number less than 11 = “+queue);      }  }  

Test it Now

Output:

Total no : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]   Number less than 11 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Example 2

  import java.util.concurrent.ConcurrentLinkedQueue;  import java.util.function.Predicate;  public class ConcurrentLinkedQueueRemoveIfExample2 {      public static void main(String[] args) {          ConcurrentLinkedQueue<IsVoter> queue = new ConcurrentLinkedQueue<IsVoter>();          IsVoter isVoter1 = new IsVoter(“Reema”,18);          IsVoter isVoter2 = new IsVoter(“Raj”,7);          IsVoter isVoter3 = new IsVoter(“Kajol”,37);          IsVoter isVoter4 = new IsVoter(“Ravi”,47);          IsVoter isVoter5 = new IsVoter(“Varun”,17);          queue.add(isVoter1);          queue.add(isVoter2);          queue.add(isVoter3);          queue.add(isVoter4);          queue.add(isVoter5);          //removes all the elements which satisfies the Predicate filter          Predicate<IsVoter> pr= (IsVoter age) ->(age.age < 18);          queue.removeIf(pr );          System.out.println(” People eligible to vote : “);          for (IsVoter xyz : queue ){              System.out.println(xyz);          }      }  }  class IsVoter {      String name;      int age;      public IsVoter(String name, int age) {          this.name = name;          this.age = age;      }      public String toString() {          return “Name = ” + this.name + ”  Age = ” + this.age;      }  }  

Test it Now

Output:

People eligible to vote :   Name = Reema  Age = 18  Name = Kajol  Age = 37  Name = Ravi  Age = 47

Example 3

  import java.util.concurrent.ConcurrentLinkedQueue;  import java.util.function.Predicate;  public class ConcurrentLinkedQueueRemoveIfExample3 {      public static void main(String[] args) {         ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();          for (int i=1;i<21;i++){              queue.add(i);}          System.out.println(“Total no : “+ queue);          //removes all the elements which satisfies the predicate filter          Predicate<Integer> pr=null;          queue.removeIf(pr );          System.out.println(queue);      }  }  

Test it Now

Output:

Exception in thread "main" java.lang.NullPointerException  at java.util.Objects.requireNonNull(Objects.java:203)  Total no : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]  at java.util.Collection.removeIf(Collection.java:410)  at com.tutorAspire.ConcurrentLinkedQueueRemoveIfExample3.main(ConcurrentLinkedQueueRemoveIfExample3.java:13)

Next TopicJava ConcurrentLinkedQueue

Java ConcurrentLinkedQueue removeIf() Method

Java ConcurrentLinkedQueue removeIf() Method

Syntax:

Parameters:

Specified By:

Return Value:

Throws:

Example 1

Example 2

Example 3

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