Set interface extends Collection interface and Collection has stream() method that returns a sequential stream of the collection. Below given are some examples to understand the implementation in a better way. Example 1 : Converting Integer HashSet to Stream of Integers.
// Java code for converting
// Set to Stream
import java.util.*;
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args) {
// Creating an Integer HashSet
Set<Integer> set = new HashSet<>();
// adding elements in set
set.add(2);
set.add(4);
set.add(6);
set.add(8);
set.add(10);
set.add(12);
// converting Set to Stream
Stream<Integer> stream = set.stream();
// displaying elements of Stream using lambda expression
stream.forEach(elem->System.out.print(elem+" "));
}
}
Output:
2 4 6 8 10 12
Example 2 : Converting HashSet of String to stream.
// Java code for converting
// Set to Stream
import java.util.*;
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args) {
// Creating an String HashSet
Set<String> set = new HashSet<>();
// adding elements in set
set.add("Geeks");
set.add("for");
set.add("GeeksQuiz");
set.add("GeeksforGeeks");
// converting Set to Stream
Stream<String> stream = set.stream();
// displaying elements of Stream
stream.forEach(elem -> System.out.print(elem+" "));
}
}
Output:
GeeksforGeeks Geeks for GeeksQuiz
Note : Objects that you insert in HashSet are not guaranteed to be inserted in same order. Objects are inserted based on their hash code. Convert Stream to Set in Java