Java Collections unmodifiableNavigableMap() Method

The unmodifiableNavigableMap() method of Java Collections class is used to get an unmodifiable view of the specified navigable map.

Syntax

Following is the declaration of unmodifiableNavigableMap() method:

public static <K,V> NavigableMap<K,V> unmodifiableNavigableMap(NavigableMap<? extends K, ? extends K> m)

Parameter

Parameter	Description	Required/Optional
m	It is the navigable map for which an unmodifiable view is to be returned.	Required

Returns

The unmodifiableNavigableMap() method returns an unmodifiable view of the specified navigable map.

Exceptions

Compatibility Version

Java 1.8 and above

Example 1

import java.util.*;
public class CollectionsUnmodifiableNavigableMapExample1 {
    public static void main(String[] args) {
    	  //Create object of hash map and Add values in the map
        NavigableMap<String,String> map = new TreeMap<String,String>();
        map.put("key1", "Java");
        map.put("key2", "Android");
        map.put("key3", "JavaScript");
        System.out.println("Initial Map: "+map);
        //Create unmodifiable navigable map
        NavigableMap<String,String> map2 = Collections.unmodifiableNavigableMap(map);
        System.out.println("Unmodifiable Navigable Map: " + map2);       
        map.put("key4", "JavaTpoint");
        System.out.println("Unmodifiable Navigable Map after adding: " + map2);
        }
}

Test it Now

Output:

Initial Map: {key1=Java, key2=Android, key3=JavaScript}
Unmodifiable Navigable Map: {key1=Java, key2=Android, key3=JavaScript}
Unmodifiable Navigable Map after adding: {key1=Java, key2=Android, key3=JavaScript, key4=JavaTpoint}

Example 2

import java.util.*;
public class CollectionsUnmodifiableNavigableMapExample2 {
    public static void main(String[] args) {
    	  NavigableMap<Integer, String> map = new TreeMap<>();
        map.put(1, "one");
        map.put(2, "two");
        System.out.println("Initial Unmodifiable Navigable Map: "+map);
        NavigableMap<Integer, String> map2 = Collections.unmodifiableNavigableMap(map);
        map2.put(3, "three");
        }
}

Test it Now

Output:

Initial Unmodifiable Navigable Map: {1=one, 2=two}
Exception in thread "main" java.lang.UnsupportedOperationException
	at java.base/java.util.Collections$UnmodifiableMap.put(Collections.java:1453)
	at myPackage.CollectionsUnmodifiableNavigableMapExample2.main(CollectionsUnmodifiableNavigableMapExample2.java:10)

Example 3

import java.util.*;
public class CollectionsUnmodifiableNavigableMapExample3 {
	public static void main(String[] args) {
		NavigableMap<Integer, Integer> map = new TreeMap<>();
		map.put(1, 1001);
		map.put(2, 1002);
		map.put(3, 1003);
		map.put(4, 1004);
		map.put(5, 1005);
		System.out.println("Initial map: " + map);		
		NavigableMap<Integer, Integer> map2 = Collections.unmodifiableNavigableMap(map);	
	      map.remove(4, 1004);	    	     
    	      System.out.print("Unmodifiable navigable map after remove(4, 1004): "+map2);
	      }
}

Test it Now

Output:

Initial map: {1=1001, 2=1002, 3=1003, 4=1004, 5=1005}
Unmodifiable navigable map after remove(4, 1004): {1=1001, 2=1002, 3=1003, 5=1005}

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Java Collections unmodifiableNavigableMap() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3