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Java Collections asLifoQueue() Method with Example

Collections Class asLifoQueue() method: Here, we are going to learn about the asLifoQueue() method of Collections Class with its syntax and example.
Submitted by Preeti Jain, on January 07, 2020

Collections Class asLifoQueue() method

• asLifoQueue() Method is available in java.lang package.
• asLifoQueue() Method is used to represent the given deque as a Lifo queue (LIFO means Last-in-First-Out).
• asLifoQueue() Method is a static method, so it is accessible with the class name and if we try to access the method with the class object then we will not get an error.
• asLifoQueue() Method does not throw an exception at the time of conversion from given Deque to LIFO Queue.

Syntax:

    public static Queue asLifoQueue(Deque d);

Parameter(s):

• Deque d – represent the Deque.

Return value:

The return type of the method is Queue, it returns LIFO Queue.

Example:

// Java Program is to demonstrate the example
// of Queue asLifoQueue(Deque d) method of Collections class

import java.util.*;

public class AsLifoQueue {
    public static void main(String args[]) {
        // Create a array deque object    
        Deque de = new ArrayDeque(10);

        // By using add() method is to add the
        // given elements in linked list
        de.add("C");
        de.add("C++");
        de.add("JAVA");
        de.add("DOTNET");
        de.add("PYTHON");

        // Display Deque
        System.out.println("de: " + de);

        // By using asLifoQueue() method is to 
        // represent the deque elements as lifo queue

        Queue lifo_q = Collections.asLifoQueue(de);

        System.out.println();
        System.out.println("Collections.asLifoQueue(de) :");

        // Display Queue
        System.out.println("lifo_q: " + lifo_q);
    }
}

Output

de: [C, C++, JAVA, DOTNET, PYTHON]

Collections.asLifoQueue(de) :
lifo_q: [C, C++, JAVA, DOTNET, PYTHON]