Java ArrayBlockingQueue clear() Method

The clear() method of ArrayBlockingQueue removes all the elements from the queue. The queue becomes empty after calling this method.

Syntax:

public void clear()

Program to show ArrayBlockingQueue clear() method

Let’s have a look at the program.

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

public class ArrayBlockingQueueClearExample {

	public static void main(String[] args) {
		int capacity = 5;
		BlockingQueue<Integer> salaries = new ArrayBlockingQueue<>(capacity);
		salaries.add(20000);
		salaries.add(25000);
		salaries.add(15000);
		salaries.add(17000);
		salaries.add(19000);
		System.out.println("Queue elements: \n" + salaries);
		salaries.clear();
		System.out.println("Queue after clearing all elements: \n" + salaries);
	}
}

Output:

Queue elements: 
[20000, 25000, 15000, 17000, 19000]
Queue after clearing all elements: 
[]

Example:

The below example shows how clear() method removes all the user-defined objects from the queue.

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

public class ClearDemo {

	public static void main(String[] args) {

		int capacity = 5;
		BlockingQueue<Employee> employees = new ArrayBlockingQueue<>(capacity);
		employees.add(new Employee(101, "Adam"));
		employees.add(new Employee(102, "Smith"));
		employees.add(new Employee(103, "John"));
		employees.add(new Employee(104, "Ricky"));

		for (Employee employee : employees) {
			System.out.println(employee);
		}
		employees.clear();
		System.out.println("Queue after clearing all elements: \n" + employees);
	}
}

Output:

Employee [employeeId=101, employeeName=Adam]
Employee [employeeId=102, employeeName=Smith]
Employee [employeeId=103, employeeName=John]
Employee [employeeId=104, employeeName=Ricky]
Queue after clearing all elements: 
[]

That’s all regarding the ArrayBlockingQueue clear method in Java. Please share if you find this article helpful.