How to define control flow statements in JShell in Java 9?

JShell is a new interactive command-line tool introduced in Java 9. This tool can also be called REPL (Read-Eval-Print-Loop) because it takes input, evaluates it and returns output to the user via command-line.

We can execute multiple-line control flow statements using JShell the same as Java. The control flow statements like If-else statement, for-loop and while-loop can also be executed in JShell. It recognizes multiple-line statements are prompts with the symbol “…>” to indicate to enter the next line statement.

Example of If-Else statement

jshell> int distance = 50
distance ==> 50

jshell> if(distance < 30) {
...>       System.out.println("It's near");
...>    } else {
...>       System.out.println("It's far");
...>    }
It's far

jshell>

Example of While Loop

jshell> int i = 10
i ==> 10

jshell> while(i < 25) {
...>       System.out.println(i + " ");
...>       i++;
...>    }
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

jshell>

Example of For Loop

jshell> String names[] = {"Adithya", "Jai", "Raja", "Chaitanya", "Ravi", "Surya"}
names ==> String[6] { "Adithya", "Jai", "Raja", "Chaitanya", "Ravi", "Surya" }

jshell> for(String name : names) {
...>       System.out.println(name);
...>    }
Adithya
Jai
Raja
Chaitanya
Ravi
Surya

jshell>