Java Collections unmodifiableNavigableSet​() Method with Examples

In this article we will discuss about unmodifiableNavigableSet() method.

Introduction

This method is available in NavigableSet. It is an data structure that can store elements in an order. For this we have to use tree set.

we can create a treeset by using the following syntax:

         NavigableSet<datatype> data = new TreeSet<String>();  

where,

1. datatype specifies the type of elements
2. data is the input data.

unmodifiableNavigableSet()

This method will return the unmodifiable view of the given Navigable set.

Syntax:

public static <T> NavigableSet<T> unmodifiableSortedSet(SortedSet<T> data)  

where, data is the Navigable set which is returned in an unmodifiable view.

Example1 :

• demonstration before and after modification

Java

import java.util.*;
public class GFG1 {
    // main method
    public static void main(String[] args)
    {
        // create a set named data
        NavigableSet<Integer> data = new TreeSet<Integer>();
        // Add values in the data
        data.add(1);
        data.add(2);
        data.add(3);
        data.add(34);
        // Create a Unmodifiable sorted set
        SortedSet<Integer> data2
            = Collections.unmodifiableNavigableSet(data);
        // display
        System.out.println(data);
        // add to data
        data.add(32);
        // display
        System.out.println(data2);
    }
}

Output:

[1, 2, 3, 34]
[1, 2, 3, 32, 34]

Example 2

Java

import java.util.*;
public class GFG1 {
    // main method
    public static void main(String[] args)
    {
        // create a set named data
        NavigableSet<String> data = new TreeSet<String>();
        // Add values in the data
        data.add("java");
        data.add("Python");
        data.add("R");
        data.add("sql");
        // Create a Unmodifiable sorted set
        SortedSet<String> data2
            = Collections.unmodifiableNavigableSet(data);
        // display
        System.out.println(data);
        // add to data
        data.add("bigdata/iot");
        // display
        System.out.println(data2);
    }
}

Output:

[Python, R, java, sql]
[Python, R, bigdata/iot, java, sql]