Java ArrayBlockingQueue drainTo() Method

The drainTo() method of ArrayBlockingQueue() class removes all the elements present in this queue and adds them to the provided collection.

Syntax:

public int drainTo(Collection<? super E> c)
public int drainTo(Collection<? super E> c, int maxElements)

Parameters:

c - This is the collection to which elements are transferred.

maxElements - This is the maximum number of elements to be transferred.

Specified By:

The drainTo() method of ArrayBlockingQueue class is specified by drainTo() method in interface BlockingQueue.

Example 1

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
public class ArrayBlockingQueuedrainToExample1 {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<Integer>();
        int capacity = 100;
        ArrayBlockingQueue<Integer> queue = new ArrayBlockingQueue<Integer>(capacity);
        queue.add(0);
        queue.add(1);
        queue.add(2);
        System.out.println("Elements int the queue = "+queue);
        //drainTo() method removes all available elements from this queue and adds them to the list
        queue.drainTo(list);
        System.out.println("Elements left in the queue :"+queue);
        System.out.println("Elements drained in the list"+list);
    }
}

Output:

Elements int the queue = [0, 1, 2]
Elements left in the queue :[]
Elements drained in the list[0, 1, 2]

Example 2

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
public class ArrayBlockingQueuedrainToExample2 {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<Integer>();
        int capacity = 100;
        ArrayBlockingQueue<Integer> queue = new ArrayBlockingQueue<Integer>(capacity);
        queue.add(0);
        queue.add(1);
        queue.add(2);
        queue.add(3);
        System.out.println("Elements int the queue = " + queue);
        /*drainTo() method removes at most the given number of available elements
          from this queue and adds them to the list.*/
        queue.drainTo(list,2);
        System.out.println("Elements left in the queue : "+queue);
        System.out.println("Elements drained in the list : "+list);
    }
}

Output:

Elements int the queue = [0, 1, 2, 3]
Elements left in the queue : [2, 3]
Elements drained in the list : [0, 1]

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Java ArrayBlockingQueue drainTo() Method

Syntax:

Parameters:

Specified By:

Example 1

Example 2

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Java ArrayBlockingQueue drainTo() Method

Syntax: