The checkedQueue() method of Java Collections is a method that returns a dynamically and typesafe view of the given Set. Any attempt to insert an element of the wrong type will result in an immediate ClassCastException.
Syntax:
public static <E> NavigableSet<E> checkedNavigableSet(NavigableSet<E> set, Class<E> datatype)
Parameters:
- set is an input set data
- datatype is the type of elements that set can hold
Return Type: This method will return the dynamically and typesafe view of the given Set.
Exceptions:
- ClassCastException: ClassCastException is a runtime exception raised in Java when we try to improperly cast a class from one type to another.
Example 1:
Java
// Java program to create a Tree set and// display the elements in a typesafe wayimport java.util.*; public class GFG { public static void main(String[] args) { // create a set of string type NavigableSet<String> data = new TreeSet<>(); // Insert the values into the set data.add("java"); data.add("php/jsp"); data.add("python"); data.add("R"); // type safe view of the set System.out.println(Collections.checkedNavigableSet( data, String.class)); }} |
Output
[R, java, php/jsp, python]
Example 2:
Java
// Java program to create a Tree set and// display the elements in a typesafe wayimport java.util.*; public class GFG { public static void main(String[] args) { // create a set of string type NavigableSet<Integer> data = new TreeSet<>(); // Insert the values into the set data.add(1); data.add(2); data.add(3); data.add(4); // type safe view of the set System.out.println(Collections.checkedNavigableSet( data, Integer.class)); }} |
Output
[1, 2, 3, 4]
