Java LinkedTransferQueue drainTo() method

The drainTo(Collection<? super E> c) method of LinkedTransferQueue() class removes all the elements present in this queue and adds them to the provided collection.

Syntax:

Parameter

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

Specified By:

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

Return:

This method returns the number of elements transferred.

Exceptions

NullPointerException - This exception will throw if the specified collection is null.

Example 1

import java.util.ArrayList;  
import java.util.List;  
import java.util.concurrent.LinkedTransferQueue;  
public class LinkedTransferQueueDrainToExample1 {  
    public static void main(String[] args) {  
        List<Integer> list = new ArrayList<Integer>();  
        int capacity = 100;  
        LinkedTransferQueue<Integer> deque = new LinkedTransferQueue<Integer>();  
        deque.add(0);  
        deque.add(1);  
        System.out.println("Elements int the queue = "+deque);  
        //drainTo() method removes all available elements from this queue and adds them to the list  
        deque.drainTo(list);  
        System.out.println("Elements left in the queue :"+deque);  
        System.out.println("Elements drained in the list"+list);  
    }  
}  

Test it Now

Output:

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

Example 2

import java.util.ArrayList;  
import java.util.List;  
import java.util.concurrent.LinkedTransferQueue;  
public class LinkedTransferQueueDrainToExample2 {  
    public static void main(String[] args) {  
        List<Integer> list = new ArrayList<Integer>();  
        int capacity = 100;  
        LinkedTransferQueue<Integer> deque = new LinkedTransferQueue<Integer>();  
        deque.add(0);  
        deque.add(1);  
        deque.add(2);  
        System.out.println("Elements int the queue = "+deque);  
        //drainTo() method removes all available elements from this queue and adds them to the list  
        deque.drainTo(list);  
        System.out.println("Elements left in the queue :"+deque);  
        System.out.println("Elements drained in the list"+list);  
    }  
}  

Test it Now

Output:

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

Java LinkedTransferQueue drainTo(Collection<? super E> c,int maxElements) method

The drainTo(Collection<? super E> c, int maxElements) method of LinkedTransferQueue() class removes all the elements present in this queue and adds them to the provided collection.

Syntax:

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

Parameter

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

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

Specified By:

The drainTo() method of LinkedTransferQueue class is specified by drainTo() method in interface BlockingQueue<E>.

Return:

This method returns the number of elements transferred.

Exceptions

NullPointerException ? This exception will throw if the specified collection is null.

Example 3

import java.util.ArrayList;  
import java.util.List;  
import java.util.concurrent.LinkedTransferQueue;  
public class LinkedTransferQueueDrainToExample3 {  
    public static void main(String[] args) {  
        List<Integer> list = new ArrayList<Integer>();  
        int capacity = 100;  
        LinkedTransferQueue<Integer> deque = new LinkedTransferQueue<Integer>();  
        for (int i=0;i<11;i++) {  
            deque.add(i);  
        }  
        System.out.println("Elements int the queue = "+deque);  
       /*drainTo() method removes at most the given number of available elements 
          from this queue and adds them to the list.*/  
        deque.drainTo(list,5);  
        System.out.println("Elements left in the queue :"+deque);  
        System.out.println("Elements drained in the list"+list);  
    }  
}

Test it Now

Output:

Elements int the queue = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Elements left in the queue :[5, 6, 7, 8, 9, 10]
Elements drained in the list[0, 1, 2, 3, 4]

Example 4

import java.util.ArrayList;  
import java.util.List;  
import java.util.concurrent.LinkedTransferQueue;  
public class LinkedTransferQueueDrainToExample4 {  
    public static void main(String[] args) {  
        List<String> list = new ArrayList<String>();  
        int capacity = 100;  
        LinkedTransferQueue<String> deque = new LinkedTransferQueue<String>();  
        deque.add("Harry");  
        deque.add("Jack");  
        deque.add("Kristan");  
        System.out.println("Elements int the queue = "+deque);  
        //drainTo() method removes all available elements from this queue and adds them to the list  
        deque.drainTo(list,2);  
        System.out.println("Elements left in the queue :"+deque);  
        System.out.println("Elements drained in the list"+list);  
    }  
}

Test it Now

Output:

Elements int the queue = [Harry, Jack, Kristan]
Elements left in the queue :[Kristan]
Elements drained in the list[Harry, Jack]

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Java LinkedTransferQueue drainTo() method

Syntax:

Parameter

Specified By:

Return:

Exceptions

Example 1

Example 2

Java LinkedTransferQueue drainTo(Collection<? super E> c,int maxElements) method