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Showing content from https://www.tutorialspoint.com/java/util/collections_emptynavigableset.htm below:

Java Collections emptyNavigableSet() Method

The Java Collections emptyNavigableSet() method is used to get the empty navigable set (immutable). This set is serializable.

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

public static final <T> NavigableSet<T> emptyNavigableSet()

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The following example shows the usage of Java Collection emptyNavigableSet() method to get an empty navigable set of Integers. We've created an empty navigable set using emptyNavigableSet() method and then tried adding few elements to it which results in exception.

 
package com.tutorialspoint;

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

public class CollectionsDemo {
   public static void main(String args[]) {
      
      // create an empty navigable set    
      NavigableSet<Integer> emptyNavigableSet = Collections.emptyNavigableSet();

      System.out.println("Created empty immutable navigable set: "+emptyNavigableSet);

      // try to add elements
      emptyNavigableSet.add(1);
      emptyNavigableSet.add(2);
   }    
}

Let us compile and run the above program, this will produce the following result.Exception will be thrown as the list is immutable.

Created empty immutable navigable set: []
Exception in thread "main" java.lang.UnsupportedOperationException
	at java.base/java.util.Collections$UnmodifiableCollection.add(Collections.java:1060)
	at com.tutorialspoint.CollectionsDemo.main(CollectionsDemo.java:15)

The following example shows the usage of Java Collection emptyNavigableSet() method to get an empty navigable set of Strings. We've created an empty navigable set using emptyNavigableSet() method and then tried adding few elements to it which results in exception.

 
package com.tutorialspoint;

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

public class CollectionsDemo {
   public static void main(String args[]) {
      
      // create an empty navigable set    
      NavigableSet<String> emptyNavigableSet = Collections.emptyNavigableSet();

      System.out.println("Created empty immutable navigable set: "+emptyNavigableSet);

      // try to add elements
      emptyNavigableSet.add("A");
      emptyNavigableSet.add("B");
   }    
}

Let us compile and run the above program, this will produce the following result.Exception will be thrown as the list is immutable.

Created empty immutable navigable set: []
Exception in thread "main" java.lang.UnsupportedOperationException
	at java.base/java.util.Collections$UnmodifiableCollection.add(Collections.java:1060)
	at com.tutorialspoint.CollectionsDemo.main(CollectionsDemo.java:15)

The following example shows the usage of Java Collection emptyNavigableSet() method to get an empty navigable set of Student objects. We've created an empty navigable set using emptyNavigableSet() method and then tried adding few elements to it which results in exception.

 
package com.tutorialspoint;

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

public class CollectionsDemo {
   public static void main(String args[]) {
      
      // create an empty navigable set    
      NavigableSet<Student> emptyNavigableSet = Collections.emptyNavigableSet();

      System.out.println("Created empty immutable navigable set: "+emptyNavigableSet);

      // try to add elements
      emptyNavigableSet.add(new Student(1, "Julie"));
      emptyNavigableSet.add(new Student(2, "Robert"));
   }    
}
class 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 + " ]";
   }
}

Let us compile and run the above program, this will produce the following result.Exception will be thrown as the list is immutable.

Created empty immutable navigable set: []
Exception in thread "main" java.lang.UnsupportedOperationException
	at java.base/java.util.Collections$UnmodifiableCollection.add(Collections.java:1060)
	at com.tutorialspoint.CollectionsDemo.main(CollectionsDemo.java:15)

java_util_collections.htm

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