How to use intermediate stream operations in JShell in Java 9?

JShell is a tool introduced in Java 9 that accepts simple statements as Take input, such as expressions, variables, methods, classes, etc., and produce instant results.

A stream (Stream) is a sequence of values. An Intermediate Stream Operation (Intermediate Stream Operation) is an operation that operates on a stream. For example, it can be applied to a lambda expression and produce another stream as the result.

The following are the most commonly used intermediate stream operations:

• 1) sorted(): This method retains the elements of the consumed stream as the result, but also Sort them according to their natural sort order.
• 2) distinct(): This method returns a stream that retains only the unique elements in the input stream and can maintain the relative order of the retained elements.
• 3) filter(): This method can filter stream elements based on some logic.
• 4) map(): This method applies a lambda expression to calculate the new result of the input stream element. It then returns these results as output to a stream.

In the following code snippet, we can implement different intermediate stream operations in JShell tool.

Code snippet

<strong>jshell> List<Integer> numbers = List.of(3, 10, 23, 200, 77, 9, 32);
numbers ==> [3, 10, 23, 200, 77, 9, 32]

jshell> numbers.stream().sorted().forEach(elem -> System.out.println(elem));
3
9
10
23
32
77
200
</strong>
<strong>jshell> List<Integer> numbers = List.of(3, 5, 54, 280, 5, 9, 40);
numbers ==> [3, 5, 54, 280, 5, 9, 40]

jshell> numbers.stream().distinct().forEach(elem -> System.out.println(elem));
3
5
54
280
9
40

</strong><strong>jshell> numbers.stream().distinct().sorted().forEach(elem -> System.out.println(elem));
3
5
9
40
54
280
</strong>
<strong>jshell> numbers.stream().distinct().map(num -> num * num).forEach(elem -> System.out.println(elem));
9
25
2916
78400
81
1600</strong>

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