Java Collections unmodifiableSortedSet() Method

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Description

The Java Collections unmodifiableSortedSet() method is used to return a immutable (thread-safe) sorted set backed by the specified sorted set.

Declaration

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

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

Parameters

s − This is the sorted set to be "wrapped" in a immutable sorted set.

Return Value

• The method call returns a immutable view of the specified sorted set.

Exception

NA

Getting Immutable Set From a SortedSet of Integer Example

The following example shows the usage of Java Collection unmodifiableSortedSet(SortedSet) method. We've created a SortedSet object of Integer. Few entries are added and then using unmodifiableSortedSet(SortedSet) method, we've retrieved the immutable version of sorted set and printed the sorted set.

 package com.tutorialspoint; import java.util.Collections; import java.util.TreeSet; import java.util.SortedSet; public class CollectionsDemo { public static void main(String[] args) { // create sorted set SortedSet<Integer> sortedSet = new TreeSet<Integer>(); // populate the sorted set sortedSet.add(1); sortedSet.add(2); sortedSet.add(3); // create a immutable sorted set SortedSet<Integer> immutableSet = Collections.unmodifiableSortedSet(sortedSet); System.out.println("Immutable sorted set is :"+immutableSet); } } 

Output

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

 Immutable sorted set is :[1, 2, 3] 

Getting Immutable Set From a SortedSet of String Example

The following example shows the usage of Java Collection unmodifiableSortedSet(SortedSet) method. We've created a SortedSet object of String and String. Few entries are added and then using unmodifiableSortedSet(SortedSet) method, we've retrieved the immutable version of map and printed the map.

 package com.tutorialspoint; import java.util.Collections; import java.util.TreeSet; import java.util.SortedSet; public class CollectionsDemo { public static void main(String[] args) { // create sorted set SortedSet<String> sortedSet = new TreeSet<String>(); // populate the sorted set sortedSet.add("TP"); sortedSet.add("IS"); sortedSet.add("BEST"); // create a immutable sorted set SortedSet<String> immutableSet = Collections.unmodifiableSortedSet(sortedSet); System.out.println("Immutable sorted set is :"+immutableSet); } } 

Output

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

 Immutable sorted set is :[BEST, IS, TP] 

Getting Immutable Set From a SortedSet of Object Example

The following example shows the usage of Java Collection unmodifiableSortedSet(SortedSet) method. We've created a SortedSet object of String and Student object. Few entries are added and then using unmodifiableSortedSet(SortedSet) method, we've retrieved the immutable version of map and printed the map.

 package com.tutorialspoint; import java.util.Collections; import java.util.TreeSet; import java.util.SortedSet; public class CollectionsDemo { public static void main(String[] args) { // create sorted set SortedSet<Student> sortedSet = new TreeSet<Student>(); // populate the sorted set sortedSet.add(new Student(1, "Julie")); sortedSet.add(new Student(2, "Robert")); sortedSet.add(new Student(3, "Adam")); // create a immutable sorted set SortedSet<Student> immutableSet = Collections.unmodifiableSortedSet(sortedSet); System.out.println("Immutable sorted set is :"+immutableSet); } } 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 boolean equals(Object obj) { Student s = (Student)obj; return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name); } @Override public int compareTo(Student student) { return this.rollNo - student.rollNo; } } 

Output

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

 Immutable sorted set is :[[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]]