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Java Collections checkedList() Method with Example

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

Collections Class checkedList() method

• checkedList() Method is available in java.lang package.
• checkedList() Method is used to return the typesafe view of the given List at runtime.
• checkedList() 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.
• checkedList() Method does not throw an exception at the time of returning validated List.

Syntax:

    public static List checkedList(List l, Class ele_ty);

Parameter(s):

• List l – represents the list for which to get typesafe view at runtime.
• Class ele_ty – represents the element type (ele_ty) that the given List is allowed to store.

Return value:

The return type of the method is List, it returns typesafe or validated view of the given List dynamically.

Example:

// Java Program is to demonstrate the example
// of List checkedList(List l, Class ele_ty) of Collections class

import java.util.*;

public class CheckedList {
    public static void main(String args[]) {
        // Create a linked list object    
        LinkedList < Integer > link_list = new LinkedList < Integer > ();

        // By using add() method is to add the
        // given elements in linked list
        link_list.add(20);
        link_list.add(10);
        link_list.add(30);
        link_list.add(40);
        link_list.add(50);

        // Display LinkedList
        System.out.println("link_list: " + link_list);

        // By using checkedList() method is to 
        // represent the type safe view of the given
        // Collection linked list

        Collection < Integer > co = Collections.checkedList(link_list, Integer.class);

        System.out.println();
        System.out.println("Collections.checkedList(link_list, Integer.class) :");

        // Display collection
        System.out.println("co: " + co);
    }
}

Output

link_list: [20, 10, 30, 40, 50]

Collections.checkedList(link_list, Integer.class) :
co: [20, 10, 30, 40, 50]