Java Collections checkedNavigableSet() Method

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Description

The Java Collections checkedNavigableSet(NavigableSet<E>, Class<E>) method is used to get a dynamically typesafe view of the specified navigable set.

Declaration

Following is the declaration for java.util.Collections.checkedNavigableSet() method.

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

Parameters

• s − This is the navigable set for which a dynamically typesafe view is to be returned.

• type −- This is the type of element that s is permitted to hold.

Return Value

The method call returns a dynamically typesafe view of the specified navigable set.

Exception

NA

Getting a TypeSafe Navigable Set from a Set of Integer Example

The following example shows the usage of Java Collection checkedNavigableSet(NavigableSet,Class ) method to get a typesafe view of navigable set of integers. We've created a set object with some integers, printed the original set. Using checkedNavigableSet(NavigableSet, Integer) method, we're getting a navigable set of Integer and then it is printed.

package com.tutorialspoint;

import java.util.Collections;
import java.util.NavigableSet;
import java.util.TreeSet;

public class CollectionsDemo {

   public static void main(String[] args) {
      NavigableSet<Integer> set = new TreeSet<>();

      set.add(1);
      set.add(2);
      set.add(3);
      set.add(4);
      set.add(5);

      System.out.println("Initial collection value: " + set);

      NavigableSet<Integer> safeSet = Collections.checkedNavigableSet(set, Integer.class);
      System.out.println("Typesafe View: "+safeSet);
   }
}

Output

Let us compile and run the above program, this will produce the following result.

Initial collection value: [1, 2, 3, 4, 5]
Typesafe View: [1, 2, 3, 4, 5]

Getting a TypeSafe Navigable Set from a Set of String Example

The following example shows the usage of Java Collection checkedNavigableSet(NavigableSet,Class ) method to get a typesafe view of set of strings. We've created a set object with some integers, printed the original set. Using checkedNavigableSet(NavigableSet, String) method, we're getting a navigable set of String and then it is printed.

package com.tutorialspoint;

import java.util.Collections;
import java.util.NavigableSet;
import java.util.TreeSet;

public class CollectionsDemo {

   public static void main(String[] args) {
      NavigableSet<String> set = new TreeSet<>();

      set.add("Welcome");
      set.add("to");
      set.add("Tutorialspoint");

      System.out.println("Initial collection value: " + set);

      NavigableSet<String> safeSet = Collections.checkedNavigableSet(set, String.class);
      System.out.println("Typesafe View: "+safeSet);
   }
}

Output

Let us compile and run the above program, this will produce the following result.

Initial collection value: [Tutorialspoint, Welcome, to]
Typesafe View: [Tutorialspoint, Welcome, to]

Getting a TypeSafe Navigable Set from a Set of Object Example

The following example shows the usage of Java Collection checkedNavigableSet(NavigableSet,Class ) method to get a typesafe view of set of Student objects. We've created a NavigableSet object with some student objects, printed the original set. Using checkedNavigableSet(NavigableSet, Student) method, we're getting a NavigableSet of Students and then it is printed.

package com.tutorialspoint;

import java.util.Collections;
import java.util.NavigableSet;
import java.util.TreeSet;

public class CollectionsDemo {

   public static void main(String[] args) {
      NavigableSet<Student> set = new TreeSet<>();

      set.add(new Student(1, "Julie"));
      set.add(new Student(2, "Robert"));
      set.add(new Student(3, "Adam"));

      System.out.println("Initial collection value: " + set);

      NavigableSet<Student> safeSet = Collections.checkedNavigableSet(set, Student.class);
      System.out.println("Typesafe View: "+safeSet);
   }
}
class Student implements Comparable<Student> {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }

   @Override
   public int compareTo(Student student) {
      return student.rollNo - this.rollNo;
   }
}

Output

Let us compile and run the above program, this will produce the following result.

Initial collection value: [[ 3, Adam ], [ 2, Robert ], [ 1, Julie ]]
Typesafe View: [[ 3, Adam ], [ 2, Robert ], [ 1, Julie ]]