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 way import 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 way import 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]