Stream sorted(Comparator comparator) returns a stream consisting of the elements of this stream, sorted according to the provided Comparator. For ordered streams, the sort method is stable but for unordered streams, no stability is guaranteed. It is a stateful intermediate operation i.e, it may incorporate state from previously seen elements when processing new elements. In java 8, Comparator can be instantiated using lambda expression. We can also reverse the natural ordering as well as ordering provided by Comparator.
Syntax :
Stream<T> sorted(Comparator<? super T> comparator) Where, Stream is an interface and T is the type of stream elements. comparator is used to compare stream elements.
Below given are some examples to understand the implementation of the function in a better way.
Example 1 :
// Implementation of Stream.sorted()// to get a stream of sorted elements// according to the provided Comparatorimport java.util.*;import java.util.stream.Stream; class GFG { // Driver code public static void main(String[] args) { // Creating a list of Integers List<Integer> list = Arrays.asList(5, -10, 7, -18, 23); System.out.println("The sorted stream according " + "to provided Comparator is : "); // Displaying the list of Strings in // reverse order after sorting list.stream().sorted(Comparator.reverseOrder()). forEach(System.out::println); }} |
Output :
The sorted stream according to provided Comparator is : 23 7 5 -10 -18
Example 2 :
// Implementation of Stream.sorted()// to get a stream of sorted elements// according to the provided Comparatorimport java.util.*;import java.util.stream.Stream; class GFG { // Driver code public static void main(String[] args) { // Creating a list of Strings List<String> list = Arrays.asList("Geeks", "for", "Lazyroar", "GeeksQuiz", "GFG"); System.out.println("The sorted stream according " + "to provided Comparator is : "); // Displaying the list of Strings in // reverse order after sorting list.stream().sorted(Comparator.reverseOrder()). forEach(System.out::println); }} |
Output :
The sorted stream according to provided Comparator is : for Lazyroar GeeksQuiz Geeks GFG
Example 3 :
// Implementation of Stream.sorted()// to get a stream of sorted elementsimport java.util.*;import java.util.stream.Stream; class GFG { // Driver code public static void main(String[] args) { // Creating an array of Strings String[] array = { "GFG", "Geeks", "for", "Lazyroar", "GeeksQuiz" }; System.out.println("The sorted stream is :"); // sorting the elements of array based // on their last character Stream.of(array).sorted((str1, str2) -> Character.compare(str1 .charAt(str1.length() - 1), str2.charAt(str2.length() - 1))) . forEach(System.out::println); }} |
Output :
The sorted stream is : GFG for Geeks Lazyroar GeeksQuiz
