Java ConcurrentLinkedQueue contains() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentLinkedQueue contains() Method

The contains() method of ConcurrentLinkedQueue class returns a Boolean value true if the specified element is present in this queue.

Syntax:

Parameters:

o – this is the object that is to be checked for the presence in this queue.

Specified By:

The contains() method of ConcurrentLinkedQueue class is specified by contains() method in interface Collection<E>.

Override:

The contains() method of class ConcurrentLinkedQueue is overridden by :

contains() method in class AbstractCollection<E>.

Return Value:

The contains() method returns the Boolean value true if the specified element is present in this queue else it returns false.

Example 1

  import java.util.Iterator;  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueContainsExample1 {      static int i=1;      public static void main(String[] args) {          ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<String>();          queue.add(“Ram”);          queue.add(“Sham”);          queue.add(“Mira”);          queue.add(“Rajesh”);          Iterator<String> iterator = queue.iterator();          //Returns an iterator over the elements          while(iterator.hasNext()){              System.out.println(i++ +”.”+iterator.next());          }           /*contains() method will return a boolean value if the            specified object is present in the queue*/          if(queue.contains(“Ram”)) {              System.out.println(“Ram is present”);          }          else{              System.out.println(“Ram is absent”);          }      }  }  

Test it Now

Output:

1.Ram  2.Sham  3.Mira  4.Rajesh  Ram is present

Example 2

  import java.util.Scanner;  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueContainsExample2 {      public static void main(String[] args) {                    ConcurrentLinkedQueue<Integer> queue = new     ConcurrentLinkedQueue<Integer>();          queue.add(3);          queue.add(5);          queue.add(7);          queue.add(2);          int a=4;          if(queue.contains(a)) {              System.out.println(“Your answer is correct.”);          }          else{          System.out.println(“Incorrect answer!”);          }      }  }  

Output:

Incorrect answer!

Example 3

  import java.util.Scanner;  import java.util.concurrent.ConcurrentLinkedQueue;  class Employee{      public static String name;      static  String date;      public Employee(String name, String date) {          this.name = name;          this.date = date;      }  }  public class ConcurrentLinkedQueueContainsExample3 {      public static void main(String[] args) {          Scanner scanner = new Scanner(System.in);      ConcurrentLinkedQueue<Employee> queue = new ConcurrentLinkedQueue<Employee>();          Employee employee1=new Employee(“Ravi”,”12.08.18″);          Employee employee2=new Employee(“Simran”,”12.08.18″);          Employee employee3=new Employee(“Raj”,”12.08.18″);          Employee employee4=new Employee(“Rajiv”,”12.08.18″);          queue.add(employee1);          queue.add(employee2);          queue.add(employee3);          queue.add(employee4);          if (queue.contains(employee2)){              System.out.println(“Simran is present on “+Employee.date);          }          else{              System.out.println(“Simran is absent on “+Employee.date);          }      }  }  

Output:

Simran is present on 12.08.18

Next TopicJava ConcurrentLinkedQueue

Java ConcurrentLinkedQueue contains() Method

Java ConcurrentLinkedQueue contains() Method

Syntax:

Parameters:

Specified By:

Override:

Return Value:

Example 1

Example 2

Example 3

Java ConcurrentHashMap putIfAbsent() Method

Java Abstract Keyword

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