Java Collections asLifoQueue() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collections asLifoQueue() Method

The asLifoQueue() is an inbuilt method of Java Collections class which returns a view of a Deque as a Last-in-first-out (LIFO) Queue. In this method, the method add and remove is mapped to push and pop operation respectively. It is useful when we want to use a method requiring a Queue but we need LIFO order.

Syntax

Following is the declaration of asLifoQueue() method:

Parameter

Parameter	Description	Required/Optional
dequeue	Dequeue the provided collection List.	Required

Returns

The asLifoQueue() method returns queue list as a result of the method call.

Exceptions

Compatibility Version

Java 1.6 and above

Example 1

  import java.util.*;  public class CollectionsAsLifoQueueExample1 {  public static void main(String[] args) {  Deque dque = new ArrayDeque(5);              dque.add(“Java”);              dque.add(“C”);              dque.add(“C++”);              dque.add(“Unix”);              dque.add(“Perl”);                      Queue q = Collections.asLifoQueue(dque);                 System.out.println(“The resultant queue is: “+q);        }  }  

Test it Now

Output:

The resultant queue is: [Java, C, C++, Unix, Perl]

Example 2

  import java.util.*;  public class CollectionsAsLifoQueueExample2 {  public static void main(String[] args) {  Deque deque = new ArrayDeque(5);  deque.add(1);        deque.add(2);        deque.add(3);        deque.add(4);        deque.add(5);                        Queue q = Collections.asLifoQueue(deque);                 System.out.println(“The resultant view of the queue is: “+q);        }  }  

Test it Now

Output:

The resultant view of the queue is: [1, 2, 3, 4, 5]

Example 3

  import java.util.*;  public class CollectionsAsLifoQueueExample3 {  public static void main(String[] args) {     Deque deque = new LinkedList<>();     //Insert the specified element into the queue represented by this dequeue           deque.offer(1);           deque.offer(2);           System.out.println(“Initial view of the queue is: “+deque);           deque.offer(3);           System.out.println(“New queue value is: “+deque);           Queue deque2 = Collections.asLifoQueue(deque);           deque2.offer(4);           deque2.offer(5);            System.out.println(“The resultant view of the queue is: “+deque2);     }  }  

Test it Now

Output:

Initial view of the queue is: [1, 2]  New queue value is: [1, 2, 3]  The resultant view of the queue is: [5, 4, 1, 2, 3]

Next TopicJava Collections Class

addAll()asLifoQueue()binarySearch()checkedCollection()CheckedMap()checkedQueue()checkedSet()collections copy()disjoint()emptyEnumeration()fill()java list max min reverse sort synchronizedMap()

Java Collections asLifoQueue() Method with Examples

Java Collections asLifoQueue() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

Java Convert boolean to String

Java Collections swap() Method with Examples

You may also like