JShell is an interactive tool that takes simple statements, expressions and etc.. as input, evaluates it, and prints the result immediately to the user.
Terminal Operation is a stream operation that takes a stream as input and doesn't return any output stream. For instance, a terminal operation can be applied to a lambda expression and returns a single result (A single primitive-value/object, or a single collection-of-objects). The reduce(), max(), and min() methods are a couple of such terminal operations.
In the below code snippet, we can use different terminal operations: min(), max(), and reduce() methods in JShell.
Snippet
jshell> IntStream.range(1, 11).reduce(0, (n1, n2) -> n1 + n2); $1 ==> 55 jshell> List.of(23, 12, 34, 53).stream().max(); | Error: | method max in interface java.util.stream.Stream cannot be applied to given types; | required: java.util.Comparator | found: no arguments | reason: actual and formal argument lists differ in length | List.of(23, 12, 34, 53).stream().max(); | ^----------------------------------^ jshell> List.of(23, 12, 34, 53).stream().max((n1, n2) -> Integer.compare(n1, n2)); $2 ==> Optional[53] jshell> $2.isPresent() $3 ==> true jshell> List.of(23, 12, 34, 53).stream().max((n1, n2) -> Integer.compare(n1, n2)).get(); $4 ==> 53 jshell> List.of(23, 12, 34, 53).stream().filter(e -> e%2==1).forEach(e -> System.out.println(e)) 23 53 jshell> List.of(23, 12, 34, 53).stream().filter(e -> e%2==1).collect(Collectors.toList()); $6 ==> [23, 53] jshell> List.of(23, 12, 34, 53).stream().min((n1, n2) -> Integer.compare(n1, n2)).get(); $8 ==> 12