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ArrayBlockingQueue toString() Method in Java

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The toString() method of ArrayBlockingQueue class is used to get a string representation of the objects of ArrayBlockingQueue. The string of ArrayBlockingQueue contains elements of ArrayBlockingQueue in the order from first(head) to last(tail), enclosed in square brackets(“[]”). The elements are separated by the characters”, ” (comma and a space). So basically the toString() method is used to convert all the elements of ArrayBlockingQueue into a String. Syntax:
public String toString()
Return Value: The method returns an String representation of ArrayBlockingQueue. Below programs illustrates toString() method of ArrayBlockingQueue class: Program 1:
// Program to demonstrate how to apply toString() method
// of ArrayBlockingQueue Class.
  
import java.util.concurrent.ArrayBlockingQueue;
  
  
public class GFG {
  
public static void main(String[] args) {
    // Define capacity of ArrayBlockingQueue
    int capacity = 5;
      
    // Create object of ArrayBlockingQueue
    ArrayBlockingQueue<Integer> queue = 
        new ArrayBlockingQueue<Integer>(capacity);
      
    // Add 5 elements to ArrayBlockingQueue
    queue.offer(423);
    queue.offer(422);
    queue.offer(421);
    queue.offer(420);
    queue.offer(424);
      
    // Print queue
    System.out.println("Queue is "+queue);
      
    // Call toString() method and Create an iterator
    String stringRepresentation=queue.toString();
      
    // Print String value returned by toString() method
    System.out.println("\nThe String returned by toString():");
    System.out.println(stringRepresentation);
      
      
    
}

                    
Output:
Queue is [423, 422, 421, 420, 424]

The String returned by toString():
[423, 422, 421, 420, 424]
Program 2:
// Program Demonstrate how to apply toString() method
// of ArrayBlockingQueue Class.
  
import java.util.concurrent.ArrayBlockingQueue;
  
  
public class GFG {
  
public static void main(String[] args) {
    // Define capacity of ArrayBlockingQueue
    int capacity = 10;
      
    // Create object of ArrayBlockingQueue
    ArrayBlockingQueue<String> queue = 
                    new ArrayBlockingQueue<String>(capacity);
        
    // Add 5 elements to ArrayBlockingQueue
    queue.offer("User");
    queue.offer("Employee");
    queue.offer("Manager");
    queue.offer("Analyst");
    queue.offer("HR");
    queue.offer("Tester");
      
    // Print queue
    System.out.println("Queue is "+queue);
      
    // Call toString() method and Create an iterator
    String stringRepresentation=queue.toString();
      
    // Print String value returned by toString() method
    System.out.println("\nThe String returned by toString():");
    System.out.println(stringRepresentation);
      
      
    
}

                    
Output:
Queue is [User, Employee, Manager, Analyst, HR, Tester]

The String returned by toString():
[User, Employee, Manager, Analyst, HR, Tester]
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ArrayBlockingQueue.html#toString

Last Updated : 26 Nov, 2018
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