How to Sort a List in Java - Step by Step Examples

How to Sort a List in Java ?

Answer

To sort a list in Java, you can use the Collections.sort() method for ascending order and the Collections.sort() method with a comparator for descending order. These methods are part of the java.util.Collections class.

✐ Examples

1 Sort a List in Ascending Order

In this example,

We create a list named numbers with integer values using the Arrays.asList() method.
We use the Collections.sort() method to sort the list in ascending order.
The Collections.sort() method sorts the elements in natural order.
Finally, we print the sorted list to the console using System.out.println().

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(5, 2, 8, 1, 3);
        Collections.sort(numbers);
        System.out.println("Sorted list in ascending order: " + numbers);
    }
}

Output

Sorted list in ascending order: [1, 2, 3, 5, 8]

2 Sort a List in Descending Order

In this example,

We create a list named numbers with integer values using the Arrays.asList() method.
We use the Collections.sort() method with Collections.reverseOrder() to sort the list in descending order.
The Collections.reverseOrder() method returns a comparator that sorts the elements in reverse natural order.
Finally, we print the sorted list to the console using System.out.println().

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(5, 2, 8, 1, 3);
        Collections.sort(numbers, Collections.reverseOrder());
        System.out.println("Sorted list in descending order: " + numbers);
    }
}

Output

Sorted list in descending order: [8, 5, 3, 2, 1]

Summary

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

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How to Sort a List in Java - Step by Step Examples

How to Sort a List in Java ?

Answer

✐ Examples

1 Sort a List in Ascending Order

Java Program

Output

2 Sort a List in Descending Order

Java Program

Output

Summary

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