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How to implement a lambda expression in JShell in Java 9?
JShell is a Java's first REPL and command-line tool that provides interactive use of Java programming language elements. We can test the functionality in isolation of a class by using this tool. JShell creates a simple and easy programming environment in the command-line that takes input from the user, reads it, and prints the result. A lambda expression is a function that has created without belonging to any class.
In the below example, we can implement a lambda expression in JShell.
C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> Consumer<String> s = (String s) -> System.out.println(s) s ==> $Lambda$14/1268066861@3159c4b8
If we can’t remember the method of Consumer interface then type the name of a variable created followed by a dot and press tab. It populates a list of methods that can be called on the Consumer interface.
jshell> s.
accept( andThen( equals( getClass() hashCode()
notify() notifyAll() toString() wait(
jshell> s.accept("Welcome to Tutorialspoint")
Welcome to Tutorialspoint
Updated on: 16-Mar-2020
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