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
import java.util.concurrent.LinkedBlockingQueue;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
int capacityOfQueue = 4;
LinkedBlockingQueue<String> linkedQueue
= new LinkedBlockingQueue<String>(capacityOfQueue);
linkedQueue.put("Karan");
linkedQueue.put("Suraj");
linkedQueue.put("Harsh");
linkedQueue.put("Rahul");
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
import java.util.Iterator;
import java.util.concurrent.LinkedBlockingQueue;
public class GFG {
public void PutDemo() throws InterruptedException
{
int capacityOfQueue = 5;
LinkedBlockingQueue<Employee> linkedQueue
= new LinkedBlockingQueue<Employee>(capacityOfQueue);
Employee emp1 = new Employee("Ranjeet", "Tester", "29000", 27);
Employee emp2 = new Employee("Sanjeet", "Manager", "98000", 34);
Employee emp3 = new Employee("Karan", "Analyst", "44000", 30);
linkedQueue.put(emp1);
linkedQueue.put(emp2);
linkedQueue.put(emp3);
System.out.println("Details of Employees:");
Iterator itr = linkedQueue.iterator();
while (itr.hasNext())
System.out.println(itr.next());
}
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 + "]";
}
}
public static void main(String[] args)
{
GFG gfg = new GFG();
try {
gfg.PutDemo();
}
catch (InterruptedException e) {
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
import java.util.concurrent.LinkedBlockingQueue;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
int capacityOfQueue = 4;
LinkedBlockingQueue<String> linkedQueue
= new LinkedBlockingQueue<String>(capacityOfQueue);
try {
linkedQueue.put(null);
}
catch (Exception e) {
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-
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