Java Collections checkedNavigableSet() Method

The checkedNavigableSet() is an inbuilt method of Java Collections class. This method is used to get a dynamically typesafe view of the specified Navigable Set. If any attempt of inserting an element whose value has the wrong type, it will through an immediate ClassCastException.

Syntax

Following is the declaration of checkedNavigableSet() method:

public static <E> NavigableSet<E> checkedNavigableSet(NavigableSet<E> s, Class<E> type)	

Parameter

Parameter	Description	Required/Optional
s	It is the navigable set for which a dynamically typesafe view is to be returned.	Required
type	It is the type of element that s is permitted to hold.	Required

Returns

The checkedNavigableSet() method returns a dynamically typesafe view of the specified Navigable Set.

Exceptions

ClassCastException

Compatibility Version

Java 1.8 and above

Example 1

import java.util.*;
public class CollectionsCheckedNavigableSetExample1 {
	public static void main(String[] args) {
		  NavigableSet<String> set = new TreeSet<>();
		  //Insert values in the Map
		  set.add("A1");
		  set.add("B2");
		  set.add("C3");
		  set.add("D4");
	        //Create type safe view of the Set        
	        System.out.println("Type safe view of the Navigable Set is: "+Collections.checkedNavigableSet(set,String.class));
	        }
}

Test it Now

Output:

Type safe view of the Navigable Set is: [A1, B2, C3, D4]

Example 2

import java.util.*;
public class CollectionsCheckedNavigableSetExample2 {
	public static void main(String[] args) {
		NavigableSet<Integer> set = new TreeSet<>();
		//Insert values in the Map
		set.add(11);
		set.add(22);
		set.add(33);
		set.add(44);
	      //Create type safe view of the Set  
		NavigableSet<Integer> TypeSafeSet;
		TypeSafeSet = Collections.checkedNavigableSet(set,Integer.class);
	      System.out.println("The view of the Navigable Set is: "+TypeSafeSet);
	      }
}

Test it Now

Output:

The view of the Navigable Set is: [11, 22, 33, 44]

Example 3

import java.util.*;
public class CollectionsCheckedNavigableSetExample3 {
	public static void main(String[] args) {
	    NavigableSet<String> set = new TreeSet<>();
	    //Insert values in the Map
	    set.add("A");
	    set.add("B");
	    set.add("A");
	    set.add("B");
	    System.out.println("Type safe view of the Navigable Set1 is: "+Collections.checkedNavigableSet(set,String.class));
	    NavigableSet<Integer> sset = new TreeSet<>();
	    sset.add(11);
	    sset.add(12);
	    sset.add(11);
	    sset.add(12);
	    //Create type safe view of the Map        
	    System.out.println("Type safe view of the Navigable Set2 is: "+Collections.checkedNavigableSet(sset,Integer.class)); 
	    Set sset2 = sset;
          sset2.add("two");
          System.out.println("TypeSafe View: "+sset2);
	    }
}

Test it Now

Output:

Type safe view of the Navigable Set1 is: [A, B]
Type safe view of the Navigable Set2 is: [11, 12]
Exception in thread "main" java.lang.ClassCastException: java.base/java.lang.Integer cannot be cast to java.base/java.lang.String
	at java.base/java.lang.String.compareTo(String.java:124)
	at java.base/java.util.TreeMap.put(TreeMap.java:566)
	at java.base/java.util.TreeSet.add(TreeSet.java:255)
	at myPackage.CollectionCheckedNavigableSetExample3.main(CollectionCheckedNavigableSetExample3.java:21)

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