Java Utility Library

Java Collections - checkedQueue() Method

The java.util.Collections.checkedQueue() method returns a dynamically typesafe view of the specified queue. Any attempt to insert an element of the wrong type will result in an immediate ClassCastException.

Syntax

public static <E> Queue<E> checkedQueue(Queue<E> queue,
                                        Class<E> type)

Here, E is the type of element in the queue.

Parameters

`queue`	Specify the queue for which a dynamically typesafe view is to be returned.
`type`	Specify the type of element that queue is permitted to hold.

Return Value

Returns a dynamically typesafe view of the specified queue.

Exception

NA.

Example:

In the example below, the java.util.Collections.checkedQueue() method returns a dynamically typesafe view of the given queue.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a queue object
    Queue<Integer> MyList = new LinkedList<Integer>();

    //populating the list
    MyList.add(10);
    MyList.add(20);
    MyList.add(30);
    MyList.add(40);

    //printing the list
    System.out.println("MyList contains: " + MyList); 

    //creating a dynamically typesafe view
    //of the list
    Queue NewList = Collections.checkedQueue(MyList, Integer.class);

    //printing the list
    System.out.println("NewList contains: " + NewList);   
  }
}

The output of the above code will be:

MyList contains: [10, 20, 30, 40]
NewList contains: [10, 20, 30, 40]

❮ Java.util - Collections