LinkedBlockingQueue toString() Method in Java with Examples

The toString() method of LinkedBlockingQueue returns a String representation of the elements of LinkedBlockingQueue. The string of LinkedBlockingQueue contains its elements from first(head) to last(tail), enclosed in square brackets(“[]”) in proper order. The elements are separated by the characters ‘, ‘ (comma and a space). So basically the toString() method is used to convert all the elements of LinkedBlockingQueue into a String representation.

This method overrides the toString() in class AbstractCollection<E>

Syntax:

public String toString()

Return Value: This method returns a String which is the representation of the elements of LinkedBlockingQueue from first(head) to last(tail), enclosed in square brackets(“[]”) in proper order,separated by the ‘, ‘ (comma and a space).

Below programs illustrates toString() method of LinkedBlockingQueue class:

Program 1:

// Java Program Demonstrate toString()
// method of LinkedBlockingQueue

import java.util.concurrent.LinkedBlockingQueue;

public class GFG {

    public static void main(String[] args)
    {
        // define capacity of LinkedBlockingQueue
        int capacityOfQueue = 50;

        // create object of LinkedBlockingQueue
        LinkedBlockingQueue<Integer> linkedQueue
            = new LinkedBlockingQueue<Integer>(capacityOfQueue);

        // Add element to LinkedBlockingQueue
        linkedQueue.add(2300);
        linkedQueue.add(1322);
        linkedQueue.add(8945);
        linkedQueue.add(6512);

        // toString() on linkedQueue
        String queueRepresentation = linkedQueue.toString();

        // print results
        System.out.println("Queue Representation:");
        System.out.println(queueRepresentation);
    }
}

Output:

Queue Representation:
[2300, 1322, 8945, 6512]

// Java Program Demonstrate toString()
// method of LinkedBlockingQueue.

import java.util.concurrent.LinkedBlockingQueue;

public class GFG {

    // create an Employee Object with
// position and salary as an attribute
    public class Employee {

        public String name;
        public String position;
        public String salary;

     Employee(String name, String position, String salary)
        {
            this.name = name;
            this.position = position;
            this.salary = salary;
        }

        @Override
        public String toString()
        {
            return "Employee [name=" + name + ", position="
                + position + ", salary=" + salary + "]";
        }
    }

    // Main Method
    public static void main(String[] args)
    {
        GFG gfg = new GFG();
        gfg.stringRepresentation();
    }

    public void stringRepresentation()
    {

        // define capacity of LinkedBlockingQueue
        int capacity = 50;

        // create object of LinkedBlockingQueue
        LinkedBlockingQueue<Employee> linkedQueue
            = new LinkedBlockingQueue<Employee>(capacity);

        Employee emp1 = new Employee("Aman", "Analyst", "24000");
        Employee emp2 = new Employee("Sachin", "Developer", "39000");

        // Add Employee Objects to linkedQueue
        linkedQueue.add(emp1);
        linkedQueue.add(emp2);

        // toString() on linkedQueue
        String queueRepresentation = linkedQueue.toString();

        // print results
        System.out.println("Queue Representation:");
        System.out.println(queueRepresentation);
    }
}

Output:

Queue Representation:
[Employee [name=Aman, position=Analyst, salary=24000], Employee [name=Sachin, position=Developer, salary=39000]]

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingQueue.html#toString–