Stream sorted() returns a stream consisting of the elements of this stream, sorted according to natural order. 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.
Syntax :
Stream<T> sorted() Where, Stream is an interface and T is the type of stream elements.
Exception : If the elements of this stream are not Comparable, a java.lang.ClassCastException may be thrown when the terminal operation is executed.
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 elements// sorted in their natural orderimport java.util.*; class GFG { // Driver code public static void main(String[] args) { // Creating a list of integers List<Integer> list = Arrays.asList(-9, -18, 0, 25, 4); System.out.println("The sorted stream is : "); // displaying the stream with elements // sorted in natural order list.stream().sorted().forEach(System.out::println); }} |
Output:
The sorted stream is : -18 -9 0 4 25
Example 2 :
// Implementation of Stream.sorted()// to get a stream of elements// sorted in their natural orderimport java.util.*; class GFG { // Driver code public static void main(String[] args) { // Creating a list of strings List<String> list = Arrays.asList("Geeks", "for", "GeeksQuiz", "Lazyroar", "GFG"); System.out.println("The sorted stream is : "); // displaying the stream with elements // sorted in their natural order list.stream().sorted().forEach(System.out::println); }} |
Output:
The sorted stream is : GFG Geeks GeeksQuiz Lazyroar for
Example 3 :
// Using stream sorted to sort a stream// of user defined class objectsimport java.util.*; class Point{ Integer x, y; Point(Integer x, Integer y) { this.x = x; this.y = y; } public String toString() { return this.x + ", "+ this.y; } } class GFG{ public static void main(String[] args) { List<Point> aList = new ArrayList<>(); aList.add(new Point(10, 20)); aList.add(new Point(5, 10)); aList.add(new Point(1, 100)); aList.add(new Point(50, 2000)); // displaying the stream with elements // sorted according to x coordinate aList.stream() .sorted((p1, p2)->p1.x.compareTo(p2.x)) .forEach(System.out::println); }} |
Output:
1, 100 5, 10 10, 20 50, 2000
