LinkedBlockingQueue put() method in Java with Examples

Last Updated : 30 Sep, 2021

The put(E e) method of LinkedBlockingQueue inserts element passed as parameter to method at the tail of this LinkedBlockingQueue, if queue is not full. If the queue is full, then this method will wait for space to become available and after space is available, it inserts the element to LinkedBlockingQueue.

Syntax:

public void put(E e) throws InterruptedException

Parameter: This method takes a mandatory parameter e which is the element to be inserted in LinkedBlockingQueue.
Return Value: The method does not return anything.

Exception: This method throws following exceptions:

InterruptedException- when the interruption occurred at time of waiting for queue to become available
NullPointerException- if the element passed to method is null

Below programs illustrates put(E e) method of LinkedBlockingQueue class:

Program 1: Prints Element of LinkedBlockingQueue after adding new names to queue using put() method.

Java

// Java Program Demonstrate put(E e) // method of LinkedBlockingQueue  import java.util.concurrent.LinkedBlockingQueue;  public class GFG {      public static void main(String[] args)         throws InterruptedException     {         // define capacity of LinkedBlockingQueue         int capacityOfQueue = 4;          // create object of LinkedBlockingQueue         LinkedBlockingQueue<String> linkedQueue             = new LinkedBlockingQueue<String>(capacityOfQueue);          // Add element using put() method         linkedQueue.put("Karan");         linkedQueue.put("Suraj");         linkedQueue.put("Harsh");         linkedQueue.put("Rahul");          // print elements of queue         System.out.println("Items in Queue are " + linkedQueue);     } }

Output:

Items in Queue are [Karan, Suraj, Harsh, Rahul]

Program 2: Add Employee object using put method in LinkedBlockingQueue

Java

// Java Program Demonstrate put() // method of LinkedBlockingQueue  import java.util.Iterator; import java.util.concurrent.LinkedBlockingQueue; public class GFG {      public void PutDemo() throws InterruptedException     {         // define capacity of LinkedBlockingQueue         int capacityOfQueue = 5;          // create object of LinkedBlockingQueue         LinkedBlockingQueue<Employee> linkedQueue             = new LinkedBlockingQueue<Employee>(capacityOfQueue);          // Add element to LinkedBlockingQueue         Employee emp1 = new Employee("Ranjeet", "Tester", "29000", 27);         Employee emp2 = new Employee("Sanjeet", "Manager", "98000", 34);         Employee emp3 = new Employee("Karan", "Analyst", "44000", 30);          // Add Employee Objects to linkedQueue         // Using put(E e)         linkedQueue.put(emp1);         linkedQueue.put(emp2);         linkedQueue.put(emp3);          System.out.println("Details of Employees:");         // print details of linkedQueue         Iterator itr = linkedQueue.iterator();         while (itr.hasNext())             System.out.println(itr.next());     }      // create an Employee Object with name,     // position, salary and age as attributes     public class Employee {          public String name;         public String position;         public String salary;         public int Age;         Employee(String name, String position,                  String salary, int age)         {             this.name = name;             this.position = position;             this.salary = salary;             this.Age = age;         }         @Override         public String toString()         {             return "Employee [name=" + name + ", position="                 + position + ", salary=" + salary                 + ", Age=" + Age + "]";         }     }      // Main Method     public static void main(String[] args)     {         GFG gfg = new GFG();         try {             gfg.PutDemo();         }         catch (InterruptedException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     } }

Output:

Details of Employees: Employee [name=Ranjeet, position=Tester, salary=29000, Age=27] Employee [name=Sanjeet, position=Manager, salary=98000, Age=34] Employee [name=Karan, position=Analyst, salary=44000, Age=30]

Program 3: To show NullPointerException thrown by put() method

Java

// Java Program Demonstrate put(E e) // method of LinkedBlockingQueue  import java.util.concurrent.LinkedBlockingQueue;  public class GFG {      public static void main(String[] args)         throws InterruptedException     {         // define capacity of LinkedBlockingQueue         int capacityOfQueue = 4;          // create object of LinkedBlockingQueue         LinkedBlockingQueue<String> linkedQueue             = new LinkedBlockingQueue<String>(capacityOfQueue);          // try to put null value in put method         try {             linkedQueue.put(null);         }         catch (Exception e) {             // print error details             System.out.println("Exception: " + e);         }     } }

Output:

Exception: java.lang.NullPointerException

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingQueue.html#put-E-

LinkedBlockingQueue remainingCapacity() method in Java

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LinkedBlockingQueue put() method in Java with Examples

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