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
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