Java Collections unmodifiableSortedSet() Method with Examples

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The unmodifiableSortedSet() method of Java Collections is available in TreeSet. A Tree Set is a data structure that can store elements in order.

Syntax:

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

where,

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

unmodifiableSortedSet() Method

The unmodifiableSortedSet() method of the Java Collections class is used to get an unmodifiable view of the specified sorted set.

Syntax:

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

where data is the sorted set that is returned in an unmodifiable view.

Return type: This method returns an unmodifiable view of the specified Sorted Set.

Example 1:

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
        SortedSet<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.unmodifiableSortedSet(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]

Example 2:

Java

import java.util.*;
  
public class GFG1 {
    // main method
    public static void main(String[] args)
    {
        // create a set named data
        SortedSet<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.unmodifiableSortedSet(data);
        
        // display
        System.out.println(data);
        
        // add to data
        data.add(32);
        
        // display
        System.out.println(data2);
    }
}