ArrayBlockingQueue size() Method in Java Last Updated : 19 Dec, 2021 Comments Improve Suggest changes Like Article Like Report ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array. ArrayBlockingQueue class is a member of the Java Collections Framework.Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue.The queue also follows FIFO (first-in-first-out) rule for storing and removing elements from the queue.If you try to put an element into a full queue or to take an element from an empty queue then the queue will block you. The size() method returns the number of elements that queue contains. Size is an important method to see how many elements the queue contains and how many elements can be added to this queue by calculating the difference between the capacity of queue and size of the queue. Syntax: public int size() Parameters: The method does not take any parameters. Return Value:The method returns the number of elements in this queue.Below programs illustrate size() method of ArrayBlockingQueue. Program 1: Java // Program to Demonstrate the size() method // of ArrayBlockingQueue. 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 elements to ArrayBlockingQueue queue.add(23); queue.add(32); queue.add(45); // Print size of queue after adding numbers int size=queue.size(); System.out.println("After adding numbers"+ " Queue size = " +size); // Add more elements to ArrayBlockingQueue queue.add(88); queue.add(42); // Print size of queue after adding numbers size=queue.size(); System.out.println("After adding more numbers" +" Queue size = " +size); } } Program 2: Java // Program to demonstrate size() method of // ArrayBlockingQueue. import java.util.concurrent.ArrayBlockingQueue; public class GFG { public static void main(String[] args) { // Define capacity of ArrayBlockingQueue int capacity = 5; // Create object to store 5 names ArrayBlockingQueue<String> names = new ArrayBlockingQueue<String>(capacity); // Add element to ArrayBlockingQueue names.add("Aman"); names.add("Siddhant"); // Print size of queue after adding numbers int size = names.size(); System.out.println("After adding numbers"+ " Queue size = "+size); // Add more elements to ArrayBlockingQueue names.add("Raunak"); names.add("Suvo"); // Print size of queue after adding numbers size=names.size(); System.out.println("After adding more numbers"+ " Queue size = "+size); } } Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ArrayBlockingQueue.html#size() Comment More infoAdvertise with us Next Article ArrayBlockingQueue size() Method in Java A AmanSingh2210 Follow Improve Article Tags : Java Java-Collections Java - util package Java-Functions Java-ArrayBlockingQueue +1 More Practice Tags : JavaJava-Collections Similar Reads ArrayBlockingQueue Class in Java In Java, the ArrayBlockingQueue class is part of the java.util.concurrent package and implements the BlockingQueue interface. It is a thread-safe, bounded queue that helps manage producer-consumer scenarios by blocking threads when the queue is full or empty.The queue has a fixed size, specified dur 8 min read ArrayBlockingQueue add() method in Java ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array. ArrayBlockingQueue class is a member of the Java Collections Framework. Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue. The queue 3 min read ArrayBlockingQueue clear() Method in Java ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array. ArrayBlockingQueue class is a member of the Java Collections Framework.Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue.The queue al 2 min read ArrayBlockingQueue contains() method in Java ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array. ArrayBlockingQueue class is a member of the Java Collections Framework. Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue. The queue 3 min read ArrayBlockingQueue drainTo() Method in Java ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array. ArrayBlockingQueue class is a member of the Java Collections Framework.Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue.The queue al 5 min read ArrayBlockingQueue iterator() Method in Java The iterator() method of ArrayBlockingQueue class is used to returns an iterator of the same elements as this queue in a proper sequence. The elements returned from this method contains elements in order from first(head) to last(tail). The returned iterator is weakly consistent. Syntax: public Itera 2 min read ArrayBlockingQueue offer() Method in Java ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array. ArrayBlockingQueue class is a member of the Java Collections Framework. Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue. The queue 6 min read ArrayBlockingQueue peek() Method in Java ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array. ArrayBlockingQueue class is a member of the Java Collections Framework.Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue.The queue al 2 min read ArrayBlockingQueue poll() Method in Java ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array. ArrayBlockingQueue class is a member of the Java Collections Framework. Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue. The queue 4 min read ArrayBlockingQueue put() method in Java ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array. ArrayBlockingQueue class is a member of the Java Collections Framework. Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue. The queue 2 min read Like