How to define a switch statement in JShell in Java 9?

JShell is based on the REPL (Read-Evaluate-Print-Loop) introduced in Java 9. This tool can be used to execute simple statements, evaluate it, and prints the result.

A switch statement can test multiple conditions just like an else clause and handles the default possibility. The default clause can be executed when none of the cases match, and a break statement can be used to break out of switch after a successful match.

In the below code snippet, we can define the switch statement in JShell.

Snippet-1

jshell> int i = 10;
i ==> 10

jshell> switch(i) {
   ...>    case 1 : System.out.println("1");
   ...>    case 10 : System.out.println("10");
   ...>    default : System.out.println("default");
   ...> }
10
default

jshell> int i = 1;
i ==> 1

jshell> switch(i) {
   ...>    case 1 : System.out.println("1");
   ...>    case 10 : System.out.println("10");
   ...>    default : System.out.println("default");
   ...> }
1
10
default

In the below code snippet, we can define a switch statement with a break in JShell.

Snippet-2

jshell> switch(i) {
   ...>    case 1 : System.out.println("1"); break;
   ...>    case 10 : System.out.println("10"); break;
   ...>    default : System.out.println("default"); break;
   ...> }
1

raja

Updated on: 23-Apr-2020

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