How to Sort Items of a Set in Java - Step by Step Examples

◀ Previous Next ▶

How to Sort Items of a Set in Java ?

Answer

To sort items of a Set in Java, you can convert the Set to a List and use the Collections.sort() method.

✐ Examples

1 Sort Items of a Set of Integers

In this example,

We create a Set named numberSet with a set of integer values.
We convert the Set numberSet to a List using the new ArrayList<>(numberSet) constructor.
We then use the Collections.sort() method to sort the items in ascending order.
The Collections.sort() method sorts the List in place in ascending order.
Finally, we print the sorted list to standard output.

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Set<Integer> numberSet = new HashSet<>(Arrays.asList(5, 3, 8, 1, 2));
        List<Integer> sortedList = new ArrayList<>(numberSet);
        Collections.sort(sortedList);
        System.out.println("Sorted list: " + sortedList);
    }
}

Output

Sorted list: [1, 2, 3, 5, 8]

2 Sort Items of a Set of Strings

In this example,

We create a Set named stringSet with a set of string values.
We convert the Set stringSet to a List using the new ArrayList<>(stringSet) constructor.
We then use the Collections.sort() method to sort the items in alphabetical order.
The Collections.sort() method sorts the List in place in alphabetical order.
Finally, we print the sorted list to standard output.

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Set<String> stringSet = new HashSet<>(Arrays.asList("banana", "apple", "cherry", "date"));
        List<String> sortedList = new ArrayList<>(stringSet);
        Collections.sort(sortedList);
        System.out.println("Sorted list: " + sortedList);
    }
}

Output

Sorted list: [apple, banana, cherry, date]

Summary

In this tutorial, we learned How to Sort Items of a Set in Java language with well detailed examples.

◀ Previous Next ▶

Java Tutorials

Java How-Tos

How to Sort Items of a Set in Java - Step by Step Examples

How to Sort Items of a Set in Java ?

Answer

✐ Examples

1 Sort Items of a Set of Integers

Java Program

Output

2 Sort Items of a Set of Strings

Java Program

Output

Summary

More Java Sets Tutorials